Yep, we love our R-Pod RP-196 but I'm convinced it could pull any of the 190 series or less. There is a newer RP-202 which
looks nice at 4500 dry, but dual axle and will quickly go over 5000 (GVWR is 6500) - that trailer is just too much for the RL.
Other Forest River trailers similar to R-Pods which might be worth a look are E-Pro, Geo-Pro, No-Bo
Another new label is Ibex. I haven't seen this one in person, but looks interesting:
Details, floorplan, specifications, and more about the Ibex 19QBS Travel Trailers.
forestriverinc.com
+1 on the 9-speed being better all around for towing
+1 on gas. You will be looking for gas station every 200 miles, which is just part of the mid-sized pickup compromise. (We did have one "scary" time where we were in west Wyoming, and I forgot to fill up in one town, and it was almost 100 miles to next gas station, and we hit the empty light and got
really close to running out of gas in the middle of nowhere.)