This has been our experience since 2004 with an 11' Lance 1121 on a SRW 4X4 F-350 diesel. We have traveled 100,000 miles from the Florida Keys to Alaska including two trans-continental tours and an excursion to New England and Maine. We added "H" rated(5000lbs) 19'5" wheels and tires along with air bags and Rancho Adjustable Shocks.
Our primary first reason for a TC was to travel on the deep sand beaches of Assateague Island National Seashore on the Mid-
Atlantic Coast on the Maryland/Virginia shores. The NPS does not permit duallys on the beaches, so we had to adapt our truck to handle the weight, the SRW rig is a bit more nimble than duallys. We have had no problems with this set-up in all of our adventures.
Without 4X4, of course, we could not have camped for weeks on the beaches. Our many off-road excursions also would have not been possible. The upgraded wheels and tires are required for highway travel,we have 16" Nitto Dune Grapplers for the sand, the 19.5" will not air down for over sand use, Our SRW rig has been entirely satisfactory, After seven years we replaced the 19.5" tires. Although they still had good tread, cracking on the sidewalls was evident from dry rot.