Drive systems are completely different, just sayin'. The Imps drive like a tank, the SUSV steer by articulating. The SUSV is a beast, but breaking track is a whore, as it is a single piece continuous track, and there are four per vehicle. We had diesels in both 5 and 6 cylinders. The older 6 cylinders sounded like a tiger tank. But being constructed out of fiberglass and plywood there are some distinct disadvantages. C Battery burned down three of them (ironically, all bumper number C-25), each incident was due to the operator not releasing the hand brake, the brakes overheated, and the fiberglass and plywood bodies burned. Oh, the last vehicle was an ammo carrier, and the 105mm shells cooked off. The engine block melted and parts of that SUSV ended up in the Battalion commander boots. The engine block puddle was hung on Charlie Battery's dayroom wall. For the remainder of my time at Ft. Wainwright we did not have another C-25 in the battalion. Oh, I could go on and on about those, I have a few more war stories about the SUSV. Good times.
Seriously, I would love to build one up in 1:18, just like we had in 5/11 FA. I have even thought about RC using Tamiya tracks and rescaling the Paper-Replika version. But that has a different rear cab.