Some heavy duty off-roaders such as the Hummer H1/Humvee have portal axles to raise their clearance. Basically the drive axles are connected to gears that transfer the torque to the wheels. This allows the axles to be at the top of the hub instead of the middle for better clearance.
My idea is inverting that. What if you had portal gearing hooking up to the bottom of the hub? Then everything could be mounted a few inches lower and lower the CoG. The biggest problem I see is the increase in unsprung weight, but could the pros outweigh the cons?