I have an old Coachman 19' FW that I made a GN adapter for and it pulls better with the GN than with the FW. It weighs 3800# and without the GN adapter and a full tank of fresh water (tank behind axles) it wants to fishtail. With the GN it has enough pin weight it pulls great. It is an 87' model that I restored and use to hunt out of and I like it. It will spin on a dime unlike our 31' newer FW that takes more room and it pulls very smooth. The old timer has a very heavy frame and has never shown any ill effects from the GN. I wonder if I've voided the warranty?