Thanx for the replies, Envoy weight is about 4400, Pulling with 02 Itasca Suncruiser W22 Allison 5SP. 5000lb tow and 500lb tw. I am trying to figure out why pull the fuse, if key is out and parked or moving there is no need fro any power. I am going the check wiring diagram to see what they are for. Due to the short notice for us the use the envoy and get the mounts for it in time, we are going to tow our 91 Jeep Wrangler as we have before. We are bringing my mother in law with for the first time and were concerned she would not be able to get in and out of Jeep. Trial run with step stool went good. This give me more time to get needed parts with less cost. Lets me sort out what we got with the coach.