Sam,

For viscous coupling test on syncro = model, check www.concentric.net/~sxs/vctest.html. However, it was not = recommended to perform that even it works. There is a good quideline = for buying a bus, Used bus buyer's guide by Tobin Copeley at = www.type2.com. It is a very useful check list including camper option. = You may use as a quidline for yours bus.

Chayan Srisawat