Door latch problems

The door latch on my new 5th wheel is very hard to close, especially after setting up and leveling in a camp spot. When I get it home or to my dealer, it seems to close much easier. My dealer says it's fine and no repair is needed. I guess things get tweaked a little when not in a completely level spot. Looking at it, there isn't much adjustment in the striker, it's all the way out already.
Question is, does anyone know of a replacement latch that offers more adjustment or easier operation? Has anyone ever adapted a regular house door latch with a knob? I gotta do something...DW is getting PO'd every time she slams it and it won't latch.