|Unwrapped UVs:||Yes, non-overlapping|
Rig based in Conform object
When animation, manipulators are at zero position,after animation you can add a spring . After it is better to hide the manipulators.
Wheels animated using the controllers.In controls use pivot point center.
Rig based in Conform object.
In Conform pick you terrain and go.
If the landscape is very high, you need to raise all the plans from the layer Conform above, until everything becomes good.
To reset Controls - ALT+RMB+Transform To Zero.