Well I could write a book - have purchased 3 sets of tires in addition to the Marathons that came with our 36FL; Marathons blew out and took out lower panel and a fender on our 36FL; Bought Sailun tires, suspension broke, causing 2 wheels to come together at 70mph, Lippert and RW fixed and told me to get Goodyear G614s as they were "in tune" with the suspension; Goodyear lasted 9600 miles when all four wore to the steel belt on the inside of the tires; In between the Sailun and Goodyear tires we had MorRyde IS and disc brakes installed; Currently running Hercules as that was the only heavy rated tire I could find while broke down due to faulty tires in Paige AZ. So far tires running good. Get rid of the Marathons, upgrade your wheels and tires to H rated tires and larger wheels. If possible, upgrade axels and suspension and we recommend MorRyde IS (we also have 8K axels). We will be at the Rally this year in IN so stop by and my wife and I will fill you in on all the details over a cold one!!
John and "Sam"