My dealer didn't want to deal with am outside credit union as mine, which was Indiana University. They originally didn't want to sell it if I didn't finance through them or pay up front. So after negotiating a good price for over a week, I told them to forget about it and I'd buy somewhere else. They quickly changed their minds and decided to work with my credit union to get the deal done.
Other than that, I've had good luck with them and would buy again from them. But they make money off of loans and didn't want to give it up quietly. Rv dealers are not like car dealerships at all and actually make them look honest. :)