You do the maintenance that you can do and pay others to do the things you don't want to or can't do. You go on your trips and you enjoy the ride and the whole experience. If something breaks during a trip you deal with it. Pretty simple really.
Remember, you just do not read very often when someone posts on here that they just got back from a trip and did not have any problems, even tho it happens more than you think. This is a place where people usually post about a problem but in reality the posts here only represent a very small percentage of people that are enjoying the RV life style. I have had many trips with zero problems and a few with minor problems. The ONLY trip I had in the past 150,000 miles that caused any delay was only because I had to wait for a part to be delivered. As it turned out we were in a great place in Dutch John, Utah and we enjoyed our stay in a place that we would have bypassed had it not been for the problem so even tho it interrupted our original plans, we are glad that it did.