Theres merrit in the idea , but i think the front bags would need upgrading to a larger diameter to take the weight . I have seen a large bag on top of the diff in a lazy axle prime mover . When the drive lost traction the operator flicked a switch which inflated the bag , forcing the drive down .
I think if you fitted a raise/lower valve on the trailer so it could be lowered , and then have a solenoid valve/manual ball valve stopping the air back into the rear bags it would work . When you throw the raise/lower switch , the oversized front bags would take all the weight and the rear axle would just skim around untill the turn is made .