Shapeshifter: It sounds to me like your coach needs a tag axle. Perhaps it would be possible to mount one behind your present drive axle. These axles are often installed on heavy trucks forward of the front drive axle. They are liftable and many are also steerable, in the sense that they are spring loaded and will turn with the vehicle as required. They typically add about 8000 lbs of load carrying capacity and that too is adjustable I believe, determined by the amount of air pressure you allow into their air bags. It would be something to consider if you are really concerned about being stopped, weighed fined and parked. If you decided to get a tag axle, I would make certain that it is liftable in the event you are presented with a low traction situation. Transferring all the weight the tag would carry back to the driven axle would aid your traction immensely when and if the additional traction was needed.
