driving uphill on gravel driveway

A key question is what kind of coach you have. If a pusher, you have less rear overhang than if you have a front engine gasser. Gassers tend to have longer rear overhangs so with them the question of dragging with a sharp change in slope is important. The fact that it is gravel is not really an issue. I assume that you have been there a number of times and know of any sharp changes in slope. If none, you are good to go.