Tough trip, Doug!
As far as the receiver/dryer goes, several very good observations by our forum friends. The $70 quote is pretty spot on. (My background is automotive purchasing, so I can tell you the bad news about how much an OEM pays for one of these...$5-7 each!) So, the interesting concept here, for all you daring and unafraid buckaroos....to actually put the damn receiver/dryer back on!!! Why? Cuz systems don't let stuff out, nor in, like they used to. I had a supplier running an a/c system without the can. Thus, obsoleting not only the can, but ALSO, the Slee Can Skidplate. You can have a jumper tube cranked out, as long as the thing seals, and bingo. Good to go. Why? Cuz they evacuate the entire system, so there should be no moisture within, when they recharge with oil and R-134a. Your call. (And right you are 'bout using the a/c all time. Never realize how used we become to all these modern conveniences!)
Good luck on the a/c front, as well as the electrical, exhaust, and the elevation of your beast!