Great advise and ideas , as I am new to the game and trying to get our TV set up. Has any one tried an AUTO system such as " Smart Air" by Air Lift / or Auto Level Command # 2186 by Firestone Ride Rite ? any and all input is appreciated !!
Not exactly. But, I have used AirLift's wireless kit and while not exactly an auto level, it is the next best thing, especially with a toy hauler. Wireless control of the bag fill and dump. I am still using my wireless kit to control the air bags in my hitch.
The firestone kit you linked to uses a standard "HCV", height control valve. You could use that on any air ride system, and those valves are what you will find on all the air ride tractor trailers.
The suspension on my truck uses two of those valves, one on each side of the springs. They are bolted to the frame and have a link attached to the spring.
With air bags you could find your optimum height and then set those valves. Then no matter how much weight you put in the bed the bags will fill to the the level set with the links - within the operating range of the kit of course.