Airbags--what exactly do they do?

Agree with all of the above, and another option is Timbrens which are worth a look too.

Old-Biscuit wrote:
THEY will NOT increase load capacity.

Legally, you are 100% right. However, consider that on some 3/4 ton trucks the ONLY difference between the 3/4 and 1 ton is the suspension. My friend has a F250 (early 2000's with the 6.0). His frame, axle, gearing, brakes, shock absorbers, wheels are the EXACT same as the F350. The ONLY difference is the suspension... I believe just overload springs.

I believe the Firestone air bags are rated for 5,000 lbs. In theory, since everything else is the exact same as a 1 ton truck and the airbags take that additional weight, adding bags to a 3/4 ton truck would take away the only difference from a 1 ton.

Just saying, not advocating.

Airbags help with a sagging rear end (on the vehicle!)

Provide some extra shock absorbing effect

THEY will NOT increase load capacity.

you don't get extra capacity, but you get more 'spring' in the rear. (they are also called Air Springs)

so you can level the load with a little air in the bags. they support 5-100psi each.

I even have them on my 2012 F350 Dually. (which seems to want to use the overload spring way too soon)..