Air bag ?

[braggwood]

I am planning air bags on my 72 lwb, I drive a semi for a living and have been talking to our parts supplier, he told me that he has sold bags (normally used for semi cabs) to be used on s-10's. He has some that are double convulted which he says will colapse more. I plan on a low as possible stance and am wondering how inches from empty to aired up a bag would travel. I have about 9 inches from trailing arm to frame on rear(with my springs) and only 6 inches between control arms (my springs) not counting the countersunk part that a bracket will cover. Has anyone ever tried these before? I can buy these (from him giving me a break) alot cheaper than any I have seen anywhere else. Just out of curosity, @ how many pounds of air pressure would a low stance bag have. I know a semi with 8500 gallons of gas and 80,000 pounds uses 75# and empty 30,000 pounds uses 20-25#
My measurements show these bags will work on the rear, the front, my springs ars about 5and 1/2 inches across diameter, are 2600 bags that small?
Thanks for any and all help, Greg