I am a Rotisserie Side Sleeper.
The best air pad I ever used, except it had no R-Value, was an Air beam Sleeper Wide.
Bought in 2013 from Gossamer Gear. It was wide and short and light.
I think it was about 26″ wide at the shoulder and tapered down towards the bottom.
It was longitudinal tubes with two larger tubes on the outside to keep you from rolling
off easily. I think it was about 4 1/2 feet long but that didn’t matter since I sleep
with my knees pulled up. It was made by Klymit in Taiwan.
The only thing that I didn’t like was that it had no insulation so I did soend a few
cold nights on it in April down in the Gila river canyon in New Mexico.
It developed a slow leak after about 3 years and I replaced it with a Klymit
Insulated Static V Lite.  It’s heavier and doesn’t have the longitudinal tube design
as the air-beam sleeper but it is 23″x72″ and has good insulation.
But it works for me. I have thought about cutting it down shorter but don’t have any experience with working with sealing the plastic end.
I tried the cross-wise tube design of the Neo Airs and don’t like them. When I roll over
close to the edge they just throw me off onto the ground. I don’t like an air matress inflated
hard but will partially deflate until it’s comforable.
Larry S