I have the same brand 5er. It's not that hard, you don't need any extra pumps.In side the water panel is a hook up to winterize your camper. Your unit should have come with a 5ft hose that has a conector on it. Screw that hose into the winterize spot...
On my way home from the dealer with the new camper I stopped at the scales. This weight is with a brand new empty unit, the truck has no gear and only a ¼ tank of fuel. I am guessing all loaded up and ready to go for a weekend I will be around 19,00...