I have a 1979 Jayco Popup. I've rebuilt the inside and added a new canvas system. everything works great. except the lift system. When I purchased the unit it had a Chicago winch and cable lift system installed. It is a 2000 lb. capacity winch. 12V. It was new, but work very slow. Can anyone tell me what the standard winch capacity should be. Not sure if the 2000 lb is enough. Seems now I get the top half way up and thats it. Help !