what can be done as far as suspension for these trucks, other than air bagging...basically, I'm looking for performance suspension stuff

 

Coilovers are possible in front, and you could always take them from another car, if you are into welding and fitting. At the rear, the leaf springs make it more difficult.. Take a look at what Racing Beat did with the B2000 they built with a rotary a couple of years ago.

 

Did some searching can't seem to find any documentation on it