Extended Warranties
One advantage of an extended warrenty is that if you break down in lower Podunk, you have a better chance of not getting gouged for repairs. The trick is that many of the Extended Warrenty companies are 'here today, gone tomorrow' and/or 'everything is covered, except the stuff which breaks a lot'. You have to read the fine print, and more importantly, understand it, which requires a bit of knowlege about RVs and what tends to break.
Every single extended warrenty has a bit of rip off built in, as they all duplicate coverage during the factory warrenty.
Extended Warranties from the dealer are horrendously overpriced. I have gotten them down close to 50% off what they first asked, which means that the markup is astronomical. I'd say that dealer companies (at least from dealerships which have been around for a while) are probably in the middle reliablility and coverage wise. There are almost certainly better companies, cheaper, but you have to do your homework. The first question is 'what do they cover and what do they not cover?'. Read the contract. The next question is 'will they still be around when I need to file a claim?'. A good indication of this is their capitilization plan. If they put a large, fixed percentage of all premiums into a trust to pay repairs, then their chances of going bankrupt is rather lower than one which just 'wings it'. Finally, 'how much of a hassle is it to file a claim?' This is perhaps the hardest to analyze, unless you can find someone who has done it, or perhaps the BBB, etc.
I don't know any good companies for RVs yet (the one from the dealer for my trailer was so cheap and there is not as much which can go wrong with a trailer, so that it was not worth finding a better one), but I did find one company through the internet (from the site which helped me get a good price on the truck, so I trusted their recommendation) which seems to be top notch for my new truck. They cover everything except maintenance items and the price was nice. So there may be the equivalent available for RVs. If I needed one (got a motorhome), I'd start with Good Sam club or equivalent and see if they have recommendations (I think they may have their own emergency service plan, which is the most useful part).
After all, if your problems only occur in, or can be put up with until you return to, your home area, you have the 'home turf' advantage, in that you can get to know the local shops, can shop around for parts and/or labor costs, and if you wish, even do some repairs yourself.