This is an early drawing of a proposal for BikeRV:
Front drive and rear steer is appealing because the front wheels do not need to steer "in to" the cabin space, and also give a simple drivetrain. However, for some fairly fundamental reasons, rear-steer vehicles tend to have dangerous handling.
Also, a tall, narrow, light vehicle is prone to blow over.
An alternative may be a four-wheeler with front- and rear-steering wheels. With limited wheel steering, the cabin intrusion could be reduced; and also low-cost rag joints rather than more-expensive metal universal or other joints. Further, using wide rear wheel spacing would both improve stability and allow the total height to be reduce