Browsing something brought about a chain of thoughts that lead me to realize I never finished this post on getting a new propane tank.
It took at good 9 weeks to get the new tank, but it finally came on a nice pallet right to my door. I took it to a local RV shop to install, as I didn't want to figure some way to jack up the Concourse, and might have had trouble getting the rusted bolts off, anyway. Besides, I'm much more comfortable working inside the vehicle than on the outside. The new tank is an exact replacement for the old tank, and slipped into the exact spot, even to the bolts (my RV guy put in new bolts with thread-locker sealing to help against future rusting, like you'd expect - but a highly recommended small truck shop, that I used to go to, twice re-used old rusted bolts and nuts!). Just what I was hoping for. Looks beautiful
For anyone that wants an exact replacement like I did, I would recommend the Tarantin people. I think the shipping ended up $75, so it was just about a round $800 to get the new tank, plus installation.
It's hard to be exact about the installation cost - it was 3 hours total, but that labor included removing my black and gray tanks, as I am in the process of getting them replaced, too (the cracks in them that had been glued shut only lasted a couple of years consisting of maybe 6,000 miles on mostly highways, so I decided it wasn't worth it to try that again, especially if I start full-timing it).
Bob