rv jj,
I see you are in my neighborhood. am interested in this as well. I have a 1997 Xplorer 230XL. I sand and paint my propane tank under the van every 2 years or so. But I'm thinking I should have it replaced. It seems only RV shops do that. None of the propane or tank places I have called do that. I would not try this myself. I found the tank for $470 or so, but the one rv shop, Klines in Warren, said they would supply the tank (to make the profit on it) and would charge $130/hour for the labor.
Here is the tank. You can see where it is mounted.
https://www.rvautoparts.com/6814-Manchester-Tank-Propane-Tank-ASME-Permanent-Mount-Tank_p_34213.html?gclid=EAIaIQobChMI38e8-trz4wIVy8DACh0sygokEAQYBSABEgIZMPD_BwE
We should meet to show each our Xplorers.