I refuse to buy from a dealer who only services trailers bought from that dealer. It tells me plenty about that dealer and what I can expect later. Not a good policy. Most RV warranties are for 1 year only. Small things I'll take care of myself. Major issues I'll make the drive if I have to.
I bought my trailer in Nevada but live in Arizona. The AZ dealers did not have the trailer I wanted and could not get one in any reasonable amount of time. However, the local AZ dealers service dept. has been excellent in handling any issues I've had. They know I'll surely refer others to their dealership in the future!