Getting ready to put new tires on my fifth wheel. Definitely going to get LT tires with a high load capacity- Will send this unit down the road in a year or two so I don't want to buy 17.5 " wheels so...
With 6 load range E at 3042 that is 18252 pounds capacity on the three axles. Put Ribs or R250s on it and replace them again in 6-8 years. That's what many TH'r users do.