Another 'why'? Why not just fix it if it breaks?
The assumption is y'all are pretty handy and DIY as an older coach is going to need lots of little fix-it stuff. Heck, even the new ones do but most have the dealer do it under warranty.
Keep your $$, buy some gas, have some fun, do the periodic maint stuff, and fix it if breaks.
My first motorhome was a 1979 Dodge. 26' with 440. Was like a relic. Fixed all up and enjoyed the heck out of it. It was a Georgie Boy Swinger. Had purple and pink stripes, across the back it said 'Swinger'. Wifey called it the 'shaggin-waggin'.