issue with vehicle + trailer

[gjaegy]

Hi,

I am trying to model a truck with a trailer, using two btRaycastVehicle objects linked together using a btUniversalConstraint constraint.

This seems to work pretty well, however I have one issue I can't solve.

Actually, the trailer is linked to the truck at its back, as shown on the picture attached. Now, the truck rear suspension are compressed, whatever the values for the wheel suspensions properties are : I have tried to increase the stiffness value, to change the damping values, etc... but the rear suspensions are still compressed extremely.

Now, in the property grid one can see the values currently used, wheels being numbered from front to back, left to right (top view). So the truck rear gears are VehicleWheel2 and 3.

I don't understand why this happen. Any idea ?

Thanks for your help,
Gregory