The trailer being worth more than the ring is debateable. I got a M66 ring that I am currently installing on my deuce, but I wouldn't trade it for a M105. I was up at Mechanicsburg a couple of weeks ago and there were about 10-20 M66 rings, complete with some looking pretty new, being shredded. They are being demilled and will not be sold. Even the backrest pads are being shredded.
M105's are a dime a dozen, but M66 rings that are out there are the only ones left and the price for them will only go up. There is a guy on Ebay who is selling them, he's in TX and I think he may only have one or two complete ones left. Shipping will be costly though, all depends on how bad you want one.