"He also sells units with hardly any cosmetic problems but have a salvage title. I suspect he's getting these from an insurance sale of some sort. He claims a rebuilt title is easy to acquire?"
Every State has their own laws on salvage.
The range from easy to difficult.
I looked at the requirement for salvage title in Ga.
The State Code was like a puzzle and I read a lot of State Code before retirement. Here you must be a licensed business and many hoops to jump.
Other States make it simple.
The best advise is contact you local DMV or search your State's requirements on the web.