Funny that you mention drilling and hurdles. Drilling requires a platform which should be (as other posters pointed out) heavy and low to the ground. Hurdles, as in boulders, are much easier to handle with lighter vehicles with plenty of ground clearance (so they can "Get over it"). So here we have two key requirements that are fundamentally at odds with one another, that's just one of the many reasons "this is so hard!"

FYI, the way Scarab solves the problem is with a nice combination of pitch averaging and variable wheel base.