Add a Center Wheel
Sure, a left or right sided wheel can be used as a 'center' wheel but it's awkward looking after compensating for its dimensions. I can make a jet, but the front wheel can't be built straight down. I can make a motorcycle, but it really wouldn't look right with a bunch of mass sticking from the side. It would also help with size critical vehicles where it might be nicer for the wheel setup to exist more in the outer armor rather than the internal space where more stuff could be shoved.