Help! What kind of bags do I need?

[bama51]

My 72 2wd Jimmy has been lowered 5" in the rear with Early Classic Enterprises shock relocation kit. I want to be able to still pull my small utility trailer, but the hitch is borderline too low. I would like to replace the springs with some air bags that I could pump up to give that extra 1-2 inches I really need. Any suggestions? I don't want the complete "air ride" setup, just replacement for the springs with a manual (meaning me) air controller.