I personally would take a towed, but my thought is, "What would you pull with an older motorhome that would be light enough to pull in the western mountains?" You would certainly have to be selective to get something light enough to pull and be able to stop it. Also the suggestion about unhooking and driving the toad up long passes is a good idea with that unit. .
Best of luck on the choice you make and I hope you will have a great trip. It would be interesting if you posted what you did and how it went.
Happy travels
Arnold
