[el curioso]

I would think it would be difficult, do to the limitation of the air bag as ur spring. It can be made using a check valve on the exhaust side of the bag but then the suspension would drop another issue needing to be adressed(sp?) it can be accomplishe easily using air cylinders. But the ride would be horrable unless an accumulator is used therefore adding to the build $$ wise.

Can it be done? Yes, it can it just take ingenuity, time and money... It just cheaper to add hydros with accumulators in my opinion.