Predictika · Heavy off-road chassis orders

An AI sales agent's Phoenix chassis order, checked before it goes out

An AI sales agent prepares an order for a heavy off-road truck chassis with its axle configuration, engine, gearbox, cab, superstructure and options. Before it goes out, the agent sends it to Predictika, which checks it against a declarative model of the compatibility and ordering rules and returns a verdict, every reason and the figures it computed.

Scope: Tatra Phoenix chassis orders: 4x4, 6x6 and 8x8 with Paccar MX-11, MX-13 and PX-7 engines, ZF TraXon and Allison gearboxes, cab variants, superstructures, power take-off, cooler, camera system and obstacle detection. See everything this validator covers

This validator models Tatra Phoenix chassis orders for the configurations above, not just the scenarios shown below. The axle configurations, engine names and ratings, gearboxes, cab variants and option names are Tatra Trucks names from its public pages; the compatibility rules are modeled from comparable heavy off-road chassis and are not published by Tatra Trucks.

  • Axles and engines — 4x4, 6x6 and 8x8 chassis with the 227 kW PX-7, 300 and 330 kW MX-11, and 315, 355 and 390 kW MX-13 engines; the engine power and axle count on the quote are compared with what the configuration gives.
  • Gearbox, cab and options — ZF TraXon automated and Allison fully automatic gearboxes, the day, extended sleeper and raised-roof sleeper cabs with their berths, the power take-off and gearbox cooler, the Digital Vision camera system and obstacle detection.
  • Superstructures — bare chassis, hydraulic crane, concrete mixer, forestry carrier and motorhome, checked against axle configuration, power take-off and cab.

Any Phoenix order in these configurations that touches these rules is in scope — not only the scenarios pictured here. Not covered: prices (this validator produces no price build-up or line-item quote), wheelbases, payloads, multi-axle configurations beyond 8x8, other Tatra model lines and the full option catalog. Every compatibility rule shown is modeled and illustrative, not Tatra-published.

The AI sales agentBuilds the chassis order from the conversation and says it is ready.
Predictika validatorChecks every rule at once and returns the verdict, each finding, and the computed figures.

7 scenarios in 3 groups · each group runs from the agent’s first attempt to the outcome · click one to switch

What the agent proposes

The AI sales agent says

Illustrative agent statement. The validator receives the structured request below.

Proposing agent: AI sales agent (scripted)

Before sending, the agent must call Recorded run

Predictika validator


      

        
        
        
      

      
Waiting for the call.

      
    

  

  
  

    
Where rules-based CPQ gets it wrong
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Our assessment of what a typical rules-based CPQ (product rules, price rules and validation rules, as in Salesforce CPQ) does with the same cases. It is a judgment about effort and reliability, not a claim that nothing can be built.

    
What the validator caughtTypical rules-based CPQPredictika
Engines that exist for only some axle configurationsOnly with care
A product rule per engine and axle configuration. It works, but every new engine or configuration is another set of rules to maintain.		The axle configuration and engine are in one request and every pairing is checked together.
A gearbox that depends on both engine and power take-offOnly with workarounds
The rule depends on choices on three different lines, so it needs cross-line rules that interact with the rest.		Every choice is in one request, so the conflict is found whichever order the choices arrive in.
Superstructures that need a power take-off and a heavier chassisOnly with care
Each body type needs its own set of required options and allowed axle configurations; someone has to write and maintain them.		The body, power take-off and axle configuration travel together and each missing requirement is reported.
Stated engine power and axle count that must match the chassisOnly with care
A stated figure is a free-entry field; a rule can compare it with a computed value, but someone has to write and maintain that comparison.		The stated figures travel with the order and are compared with the computed ones on every call.
Every problem returned in one answerOnly with workarounds
Rules tend to fire as the order is saved or a step is completed, so a rep often fixes one error and meets the next.		All findings come back together, whatever order the choices arrived in.

  

  

    
What this validator catches: findings from its test cases
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Every rule is checked on every call, in any order the choices arrive; one problem never hides another. Blocking findings stop the quote; approval findings need a person to sign off; everything else is computed.

    
1The 6.7 L Paccar PX-7 engine is quoted only on the 4x4 chassis; the 6x6 and 8x8 chassis need an MX-11 or MX-13 engine.
2The 8x8 chassis is quoted with the 355 kW or 390 kW Paccar MX-13 engine only.
3The fully automatic Allison gearbox is not quoted with the 390 kW MX-13 engine; use the ZF TraXon automated gearbox.
4An Allison gearbox with a power take-off needs the gearbox cooler on the quote.
5The number of berths on the quote does not match the cab: the day cab has none, the extended sleeper cab has one and the raised-roof sleeper cab has one or two.
6A hydraulic crane or a concrete mixer superstructure needs the power take-off on the quote.
7The concrete mixer and forestry carrier superstructures are quoted on the 6x6 and 8x8 chassis only.
8The motorhome superstructure is quoted with the short day cab only.
9Obstacle detection is quoted together with the Digital Vision camera system; add the camera system.
10The quote states an engine power of 390 kW, but the engine on it is rated 355 kW.
11The quote states 2 axles, but the chassis configuration on it has 3.
12The quote states an engine power of 315 kW, but the engine on it is rated 355 kW.
13The quote states 4 axles, but the chassis configuration on it has 3.

  

  

    
Scenarios and results
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The recorded result of the validator for each scenario on this page: the request the AI agent sent, the verdict, and every finding, in the order they appear above.

    
1. 6x6 concrete mixer: A 6x6 concrete mixer chassis with the PX-7 engine and no power take-off

    
The agent's request. Please quote a Tatra Phoenix 6x6 chassis with the Paccar PX-7 227 kW engine, the ZF TraXon automated gearbox, the short day cab with no berths, the concrete mixer superstructure, no power take-off, no gearbox cooler, Digital Vision camera system and no obstacle detection. The quote states an engine power of 227 kW and 3 axles. It is ready to send.

    
Verdict: Blocked.

    
    
      
  • Smallest engine on a multi-axle chassis. The 6.7 L Paccar PX-7 engine is quoted only on the 4x4 chassis; the 6x6 and 8x8 chassis need an MX-11 or MX-13 engine.
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  • Crane or mixer without a power take-off. A hydraulic crane or a concrete mixer superstructure needs the power take-off on the quote.
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2. 6x6 concrete mixer: The agent resubmits after fixing the errors

    
The agent's request. Please quote a Tatra Phoenix 6x6 chassis with the Paccar MX-11 330 kW engine, the ZF TraXon automated gearbox, the short day cab with no berths, the concrete mixer superstructure, power take-off, no gearbox cooler, Digital Vision camera system and no obstacle detection. The quote states an engine power of 330 kW and 3 axles. It is ready to send.

    
Verdict: Allowed.

    
    
      
  • Chassis summary. The chassis has 3 axles; the engine is rated 330 kW.
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3. 8x8 crane chassis: An 8x8 crane chassis with the MX-11 engine, Allison gearbox and no cooler

    
The agent's request. Please quote a Tatra Phoenix 8x8 chassis with the Paccar MX-11 330 kW engine, the Allison fully automatic gearbox, the extended sleeper cab with one berth, the hydraulic crane superstructure, power take-off, no gearbox cooler, no camera system and no obstacle detection. The quote states an engine power of 390 kW and 4 axles. It is ready to send.

    
Verdict: Blocked.

    
    
      
  • 8x8 without a high-output engine. The 8x8 chassis is quoted with the 355 kW or 390 kW Paccar MX-13 engine only.
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  • Allison with a power take-off but no cooler. An Allison gearbox with a power take-off needs the gearbox cooler on the quote.
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  • Stated engine power differs from the quote. The quote states an engine power of 390 kW, but the engine on it is rated 330 kW.
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4. 8x8 crane chassis: The agent resubmits after fixing the errors

    
The agent's request. Please quote a Tatra Phoenix 8x8 chassis with the Paccar MX-13 390 kW engine, the Allison fully automatic gearbox, the extended sleeper cab with one berth, the hydraulic crane superstructure, power take-off, gearbox cooler, no camera system and no obstacle detection. The quote states an engine power of 390 kW and 4 axles. It is ready to send.

    
Verdict: Blocked.

    
    
      
  • Allison with the 390 kW engine. The fully automatic Allison gearbox is not quoted with the 390 kW MX-13 engine; use the ZF TraXon automated gearbox.
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5. 8x8 crane chassis: The agent resubmits after fixing the errors

    
The agent's request. Please quote a Tatra Phoenix 8x8 chassis with the Paccar MX-13 355 kW engine, the Allison fully automatic gearbox, the extended sleeper cab with one berth, the hydraulic crane superstructure, power take-off, gearbox cooler, no camera system and no obstacle detection. The quote states an engine power of 355 kW and 4 axles. It is ready to send.

    
Verdict: Allowed.

    
    
      
  • Chassis summary. The chassis has 4 axles; the engine is rated 355 kW.
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6. 4x4 motorhome: A 4x4 motorhome chassis with a raised-roof sleeper cab and obstacle detection without the camera system

    
The agent's request. Please quote a Tatra Phoenix 4x4 chassis with the Paccar MX-11 300 kW engine, the ZF TraXon automated gearbox, the raised-roof sleeper cab with two berths, the motorhome superstructure, no power take-off, no gearbox cooler, no camera system and obstacle detection. The quote states an engine power of 300 kW and 3 axles. It is ready to send.

    
Verdict: Blocked.

    
    
      
  • Motorhome without a day cab. The motorhome superstructure is quoted with the short day cab only.
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  • Obstacle detection without the camera system. Obstacle detection is quoted together with the Digital Vision camera system; add the camera system.
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  • Stated axle count differs from the quote. The quote states 3 axles, but the chassis configuration on it has 2.
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7. 4x4 motorhome: The agent resubmits after fixing the errors

    
The agent's request. Please quote a Tatra Phoenix 4x4 chassis with the Paccar MX-11 300 kW engine, the ZF TraXon automated gearbox, the short day cab with no berths, the motorhome superstructure, no power take-off, no gearbox cooler, Digital Vision camera system and obstacle detection. The quote states an engine power of 300 kW and 2 axles. It is ready to send.

    
Verdict: Allowed.

    
    
      
  • Chassis summary. The chassis has 2 axles; the engine is rated 300 kW.
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Narration transcript
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The text of the narrated walkthrough, step by step.

    
    
      
  1. Welcome to a demo of Predictika's Validator. An AI sales agent prepares an order for a heavy off-road truck chassis with its axle configuration, engine, gearbox, cab, superstructure and options. Before it goes out, the agent sends it to Predictika, which checks it against a declarative model of the compatibility and ordering rules and returns a verdict, every reason and the figures it computed.
    2. 
      
  2. I will start with the first request by the agent.
    3. 
      
  3. The agent says. Please quote a Tatra Phoenix 8x8 chassis with the Paccar MX-11 330 kW engine, the Allison fully automatic gearbox, the extended sleeper cab with one berth. The quote states an engine power of 390 kW and 4 axles. The rest of the request is on screen.
    4. 
      
  4. Before it goes out, the agent calls the validator.
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  5. Blocked, with three findings, all in one answer. The 8x8 chassis is quoted with the 355 kW or 390 kW Paccar MX-13 engine only. An Allison gearbox with a power take-off needs the gearbox cooler on the quote. The quote states an engine power of 390 kW, but the engine on it is rated 330 kW.
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  6. The validator returned three blocking findings in one answer. A check that reads one field at a time would pass most of this; it shows only when the choices in the quote are checked against each other.
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  7. What this shows: for a gearbox that depends on both engine and power take-off, a rules-based CPQ can do this only with workarounds.
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  8. Now the agent resubmits.
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  9. The corrected request. It changes the engine to Paccar MX-13 390 kW engine and the gearbox cooler to gearbox cooler.
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  10. It calls the validator again.
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  11. Still blocked, with one finding, all in one answer. The fully automatic Allison gearbox is not quoted with the 390 kW MX-13 engine; use the ZF TraXon automated gearbox.
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  12. Three findings cleared, but the change brings a different blocking finding: Allison with the 390 kW engine.
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  13. The agent resubmits once more.
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  14. The revised request. It changes the engine to Paccar MX-13 355 kW engine and the stated engine power to 355 kW.
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  15. It calls the validator once more.
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  16. This time the validator clears it.
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  17. The earlier finding is cleared, and the validator's figure matches the quote.
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  18. Three problems caught in one call, fixed in two passes, and a clean quote. That is the value of Predictika's validator: catching mistakes before they reach the customer. Now you can try the other scenarios yourself.
    19.