[joe231]

yeah but the difference with the 4x4 analogy is that the front and rear wheels take very different paths and have major differences in the amount of area the wheels cover due to the front wheels turning side to side, if you don't turn as drastic with the front tires the bind is less severe. the problem comes when the front tires want to rotate more than the rear for the vehicle to cover the same ground binding the t-case. I think the tandems should be following a much closer path and be covering mostly the same area. but I'm in no way positive of this...
but you could use an all-time 4 wheel drive t-case, they have a built in differential