[Ozarkguy]

There is a reason they don't make them... But that being said it depends on condition... problem is they are hard to inspect unless you can get it on the bench and look at the exchangers, burner cans etc... I had one worse it had to be lit with a match.. but worked well..
Make sure you have good carbon monoxide detector for sure... One area I found was the flue thru the wall ... the ceramic ring was broken and the hot stuff was direct on the plywood ... I have a Atwood in my 37` fifth wheel and with all this cold weather lately.. its doing fine.. It's a matter of what fits without a bunch of mods...