I think it also depends on where you are camping. We stop at campgrounds where we back out onto lakes or golf courses, the RL back window works great. In other sites (for example in Yuma AZ) where the RV's are parked back to back in older campgrounds the RE would be better to hide us from our neighbours. Still prefer the RL as it's brighter inside than an RE would be.
2013 Redwood 36RL, 2011 F-450, Sat Internet, Sat TV