Just an opinion, but if asked, I'd say you'd be better off finding a cheap used
mtn. bike with a V-frame. Full suspension ain't all it's cracked up to be,
especially on a cheap FS bike. (expect a lotta down time)
If you do go with a rack mount, get a light reliable engine i.e.,
Honda GX35, Sooby 35, or a Tanaka 32 or 40. Save up the bucks,
and save yourself the headaches.