Thanks for all the responses everyone.
I didn't intend this rant to focus on the catalytic converter specifically, it's more a rant about how Chevy dealers won't work on motorhomes even though they work on equivalent vehicles, and RV repair places won't do "chassis work".
I don't *want* to use a dealer for this particular problem, but they were part of the ton of places I called.
I also was not trying to get an estimate, the shop I chose (and will probably be using) *insisted* I bring it in for him to see first. He won't give me a repair appointment until I have done that. I would have been happy for him to order the parts based on my description (and charge me up-front for them) and schedule the work.
Oh, and yeah, he may not have a lift big enough either, but at least he's willing to look at it so long as it's not raining too much that day :-D
