[rohrmann]

Many of the Montana models, if not all, were available with the optional G614's, which only come as an 85 series tire. There is a very minimal difference in physical size, so there should be no problem with fit. Your wheels should be rated 3750 lbs and 110 psi, which is perfect for these tires. If cost is an issue, the Sailuns seem to be a good substitute, but the reason we went with the G614's was availability.