Are Firestone Ride Rite air bags too small for E450 class c?

My experience with air bags with our first motor home was that the more air we put in, the harsher the ride became. That is the primary reason why I won't install air bags on our current rig. We got it handling right and the ride is "ok". I don't want to make anything worse just to get a few inches of lift. One personal negative is that I also would need to remember to deflate the air bags to clear our garage door.....what if I forget?

As far as how much "lift" ??? Each rig will have it's own numbers.