22' isn't so bad...without the bumper Crestline E350s are about 20', but 22 would still fit most places. It's kinda funny, but 23' seems so much longer but 22' seems workable.
As for shelves, you'll want them to be secure and extra strong. I've found that the metal shelves in the ambulance quickly collapse if I have any weight on them and go over a bump... the metal clips simply pop out of the rails.
Do you mean this rails?

I'm trying to find them for a week to add shelves, do you know who sells them?


