Perhaps the choicest such vehicle, if great size isn't taken into account, is a pimped-up Hummer H1. The Ford F-550 has only half the ground clearance of the former and has lesser specifications in similar categories.
That being said, I have to hand it to MisterE for his Stealth Climber, a superb piece of homemade work. Empicard's commentary on this vehicle is a good example of negative-as-positive slang, developed in recent decades -- it's sick, meaning very good.
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