AIR SHOCKS or AIR BAGS??? Need Help!

I have recently done the mod where you remove a leaf (the one above the overload spring) so that my truck sits level, and am wondering what would be better for me, the Gabriel air shocks or Air Bags. All I am wanting is to be able to still haul a decent load on a trailer with out sitting on my frame. I have read a lot about the Air Bags and they seam to be good, haven't heard much about the Gabriel Air Shocks. What do you guys think?
Also, was I correct in removing the leaf above the overload or was I to remove the overload spring itself??? aranoid:

Gabriel Air Shocks:
http://www.jcwhitney.com/autoparts/...k-AllTextSearchGroup?Ntt=nissan+titan+gabriel