RideTech offers this double convoluted air spring that has a 3400 lbs capacity at 150 PSI.
Specs:
- Minimum Height is 3"
- Ride Height is 5 to 5-1/2"
- Maximum Height is 8"
- Inflated Diameter is 8"
- Air Fitting Port is 1/4" NPT
Please Note that Firestone double convoluted air springs do not require a bump stop to avoid damage, however, your specific application may require a bump stop to maintain a safe ground clearance when deflated.