I have a "16" 38RL and we LOVE IT.... For the most part it has been trouble free. The small issues we had the dealer was able to handle in a timely manner..
We added an Onan 6.5 last year, I was debating between the 5.5 and the 6.5.. the Onan tech told me that the 6.5 would not work as hard, so I would use less LP... Sounded right to me ???
So I went with it..
Good Luck with yours, and Happy Camping...