I saw a few when I was looking that had stabilizers like you see on trailers. Not for leveling, strictly for stabilizing after level. Would obviously be much cheaper to install.
Personally I was convinced I wanted levelers, but after using the motorhome for a few months I decided the movement doesn't bother me so I'm not going to get them. Yellow Legos for me!
I did install A Levelmate Pro though, which tells you exactly how many inches each wheel needs to be raised. I really like it, level first shot every time