I purchased an electric winch for my Viking soon after I bought the PUP four years ago. Prior to the winch, I had to crank the manual winch 52 turns to raise the roof holding an air conditioner. I was worn out before I started to pull bunk ends. I bought the winch from the dealer that sold me the camper. It was easy to install and makes setup a snap. The dealer advised me which model I would need based on the size of the roof and the weight of the air conditioner. I keep the old manual winch in the PUP just in case Murphey decides to rear his head.