Not sure how Newmar was mounting windshields in 2000, but I know in 2005 they were going into an opening cut into the moulded front cap. Your jacking incident could have distorted the cap, yet I would would expect the cap to spring back into original shape once the load was off, unless something else is permanently distorted.
Cap fastens to the side walls and roof. Walls are mounted atop the floor, and roof structure sits on the top of the walls, so everything about the floor could be tilted slightly to the right, even if the frame and floor are back to level. The body structure could be distorted in the front and still square in the back.
This sounds a lot like the problems we would deal with trying to repair bodies after slow roll-over accidents. Rather than pulling on the side walls, I would consider pushing from the opposite side. But first, I would want to be sure that the distortion is not in the frame/floor structure, since twisting the frame is what originally distorted the body.