A swivel wheel trailer may be a good idea. I've thought of building one myself. This trailer allows back up of a triple tow without jackknifing. Almost all of the weight could be placed on the wheels and little on the tongue. There is debate as to whether this would be considered a trailer or a part of the camper itself. These can be bought ready made or you can build your own. You can read more about it at:
http://www.doublehitch.com/