Holy fuckies! This method proved to be even more open than I originally thought. You can bump it in a Rhino, dunno if I have mentioned it in the topic, just do the original iBSM as for bike bumping, and hit it from the same angle as for car bumping.
Also, you can break the WR for quad height easily on an iBSM, as Slim showed.
Set up an iBSM on the shoreline with the seat facing the water, and you can bump it with a boat as well.
Now I just have to figure out how to bump it with a plane or a hovercraft hmm..