We towed our 3475 Montana with a 2005 GMC 2500HD 4x4 crew cab Duremax and had no problems. I did not have to change the height of the trailer. I did add air bags and compressor, 45 gal tank, and had an edge chip in it. I don't think I would try it with a gas engine, our diesel was great. We still have the truck (loaded) siting here with 25000 miles on it for sale. We have since moved on to a SOB motorhome.
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