Drove our WH 8.1L Chevy 110,000 miles across the country and around the country over 8 years. The drive line was in tip top condition when I sold it and probably had another 90k in it before serious overhaul. The worst noise was when the electric cooling fan kicked in, usually either slugging up a long grade or caught in traffic on a hot day. Sounded like the engine was over revving. Wind noise is a coach manufacturer issue not chassis. Tiffin makes excellent bodies, I have one. Have no idea how the specific unit you are looking at would fare. Drive it!
