If you meant Lego trial trucks, here they are, if not, sorry, someone may find this useful.
These are primary rules, which are, as the time goes, somehow modified, mostly by allowing PF.
What is it
Perhaps you know the original trucktrial idea: Making offroad trucks. The Lego version is basically the same, however the rules are based on Lego parts. The whole point is that you have to build a truck that can drive over rough terrain. The terrain may be made out of Lego, papier mache, wood etc... Controlling the truck can be done by using battery packs, pole reversers and a RC unit.
The rules
The truck:
- Must look like a real truck
- Approx. scale: 1:13
- Excluding the wheels the max width is 24 studs. Including wheels the max width is 25 studs
- All wheel driven
- Must be able to steer
The wheels you may use:
- 81,6x34ZR 8880 wheels and tyres
- 81,6x34ZR 8448 wheels and tyres
- 24x43 wheels and tyres
- 68.824S wheels and tyres
What features are required:
- Real cabin with steering wheel, seats and dashboard
- Working piston engine
- The platform or construction on the back of the truck must have a width and a minimal length of 24 studs
Motors you may use:
- Standard 4,5V motor
- Old type 9V motor (sometimes referred to as 'flattie')
- New type 9V motor (sometimes referred to as 'geared')
- You may use a maximum of two motors for propulsion. You are free to use other motors for other functions, for example steering.
What is forbidden:
- Modified parts
- Non-Lego parts (except for rope)
- Lego RC motors