I was thinking of installing a roof top ac unit on my 2005 flagstaff 208. I am wondering if any of you have heard of the weight of the AC unit causing excess strain on the winch and cable system. I had called one place to get a quote for installation and he told me he would not reccomend installing Ac on a pop up due to the problems it will cause with the lift system. What do you guys think? Have any of you had problems like this?