It is not difficult to resurface your vinyl walls. At the seams, tape and mud like regular drywall (I cut about 2" of the vinyl off each side of the seam, leaving the paper backing for mud adhesion). Then prime the walls with Kilz or a primer like that. After priming, if you truly want to smooth out the wall to match the seam, skim the whole wall with a very thin layer of mud. Sand, re-prime and paint. I have tried this in various mobile homes with great success.