I have the airstream at the dealer now, and I'm not certain of the tire width #, I would guess it's a 205 X65, or X70. The hitch I have came with the airstream, but not the receiver. It has the load equalizer bars, and the ball is not on an adjustable track it's welded. To adjust the ball, I'd have to get a new hitch assembly with the slots for the load equalizer bars. That would run $290 at the dealer. I only went up an on my TV tires by little less then an inch, and it road fairly level last year, so I don't think I need to gain that much. Since I have to get new tires anyway, and they have to be taller then what I have now, I think I'll wait to see how level it is with my existing hitch. The tires have to help some. I may be able to get a better deal online if I need the hitch. It would seem that the tallest trailer tire I can get is the 235 X 75 in 15 inch, and that's still lower in profile then what most likely came on the unit new, so I'm leaning towards going that way. If I do this would it be best to go with D's for additional sidewall support, or would D's make the ride noticeably rougher?
Thanks for all the input.