We travel with a port-a-bote when we go to FL in the winter. Ours fits over the axels. Then my husband uses tension straps to lift the bote to the bottom of the camper beams. We have made about 5-6 trips this way. We are looking at getting a new camper and some of the new ones are covered underneat - so our system wouldn't work. We had a truck driver friend tell us that we had enough room under the camper for the bote.