This is actually a fairly complex request. Getting the Humvee to go over the object like a toy car is pretty easy to do. However, if you want suspension compression/extension and realistic bouncing of the vehicle coupled with acceleration and deceleration, you'll need to hand animate that. Plug-ins like DCG's Cognito can help. I don't know that the Sparrowhawk plugs are a good fit for this assignment since wheels won't be in contact with smooth ground.

Animating is not fast business. :-P