We just bought a 2015 Itasca 37f, Ford v10 f53 chassis rated at 28,000 gcwr. Trouble is, the coach came with a frame extension that is smaller than the original nine inch channel frame of the chassis. My trailer is a 28 ft Edge, about 10,000 loaded. Towing this trailer is limited to 115 miles to either t rack i race at, and we don't get out more than three or four times a year. Looking for input on what to do to make sure i don't damage this coach.