I want to use R12 because it should cool down this coach better. I have been able to buy R12 pretty cheap when looking for deals. R12 cost is not a factor since I have way more than I would ever need.

Most 507s are set up for R134. Will one of these work if I just swap out the oil or are there other differences?

I have a 95 Wanderlodge that I am setting up for R12 from scratch. I am looking for a modern day compressor recommendation that will hold up well under stress with R12 and ester oil.