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Was new, now a runner - The GrassHopper is fully ballraced (including the front wheels). I added a Tamiya 540 Sport Tuned motor, Team CRP Chrome wheel caps, CRP HP Steering Rod kit, Parma rear oil filled shocks (no body modification required to install them), You-G front oil-filled shocks (mount to stock shock tower), Parma aluminum nerf bars, and Parma dual wheel adapters front and back (photo below).
The dual wheel adapters add that Monster Hopper look. Completed several runs and found that it was impossible to flip the car over due to the extended wheel base. It adds a little weight, but allows the car to turn at full speed.
On the downside, Parma did not include any part to couple both rear wheels - so the outer wheels were spinning freely causing the car to get hung up while driving off-road. To solve the problem, I purchased a set of black high density foam hair rollers with a smooth coating and cut their length little shorter. The verdict - the foam cylinders fit along the dual wheel shaft perfectly and are the exact diameter of the inner hub caps. The pressure the foam creates between the wheels acts as a perfect coupler to keep the outer wheels from spinning freely. The car then ran great off-road and on-road with the dual wheels. (now used on-road mostly to protect the body from hard damage). See photo below for shot of the wheel couplers.