Hello Steve,
I am not up on used Roxors but you are probably good with going that way. The previous owner probably had the warranty issues taken care of. I have a new 2022 full cab from Roxor. The first issue that was prominent was whether the built in heater core had the plugs removed before the system was connected. I had my store double check that.
When I received my Roxor I found that it has a transmission/transfer case leaks. They probably forgot to put the RTV on the mating surfaces; they do not use gaskets there. I may repair that myself because my local dealer (50 miles away) cannot give me an actual date for the repair.
The only other problem that I have heard of that is prominent is the leak at the base of the Intake connection on the engine.
Like I said, maybe the previous owner had any issues taken care of.