Rick M. is right about single axle
We just put another 10,000 miles on our single axle H260 trailer this summer (after 9,000 a year ago) without a problem. Tire wear is even. We drove from Arizona to Michigan, Long Island NY, Arizona, Lake Ozark MO, Phoenix, Lake Ozark again, back to Phoenix, San Carlos, Mexico and back to Phoenix.As Rick pointed out, a single 7000 pound axle runs true. We got 13 mpg at 65 mph and 11 mpg at 80 mph. Our boat rides about a foot lower than the factory trailer. We drove to Mexico with a dual axle Catalina 250 which got 3 mpg less than we got.We have about 25,000 miles on this rig over the past three years without a problem. Our friends with the dual axle C250 have had many tire problems including a blow out with much less mileage. He said he was happy to have a dual axle when he has a blow out; I said I have a single axle (like my truck) because I don't want to have a blow out.While on Long Island, Bob Fligel (thanks to this forum) came out and saw our trailer before joining us for a sail.Nils Anderson"Godspeed"