Painting Travel Trailer Bathroom Wallpaper

If you use an oil based primer, you'll need oil based paint. Agree on the sanding. My dear cousin and hubby painted over some wallpaper with some product and then regular latex paint, did great, but I'd bet the wallpaper was not vinyl. Will something like acetone cut the vinyl finish so you could just prime with latex and then paint??? Dunno, but might be worth a test.