I agree with all of the above, but my favorite place (stretch) is the Avenue of The Giants in Northern Califonia. It is the old highway through a stretch of the redwood trees. Your coach will be fine. It is a stretch of the old road where the road weaves between the giant trees. Do remember to weave enough so that your mirrors don't hit the trees, but other than that there are no speacial precauions. When you enter Califonia, you can pick up a state park brochure most places and it will have the location and some campgrounds in the redwoods as well.