I’m going to buy a 5th wheel. I have a new Ford XLT diesel set up with a 5th wheel towing package. I would like something like a 30 foot model since it is only my wife and myself. Weight is a concern for me so my 1st question is are these ultra light models built good enough to travel 5,000-6,000 miles a year? I just don’t want to stress the truck going up mountain passes or average 5 mph On a trip.