So, as we know a huge problem inherent with reverse trikes is that the rear tire has no ability to camber, so it rolls up on its edge when turning, because of body roll.
My thought is, what if you were to basically split a conventional swingarm in half, so that there was a left and right side, which could move independently from each other. Then attach each swingarm half to its own shock absorber. Then, at the end of the swingarms, put the rear axle through a huge heim joints rated for thrust loading; one at the end of each independant swingarm half.
that way, assuming the inclination doesn't exceed that of the heim joint, the rear wheel would be able to "twist" wheen the body rolled, allowing the tire to remain planted on the ground.
Obviously, if chain drive, there would be some twisting of the roller chain, but you could solve that with this: http://www.mcmaster.com/#roller-chain/=lmvrrm
Would this work? if so it would enable the use of much wider tires in the rear, without rolloing up on an edge while turrning.