Do you need the airbags, NO. Should you have them, maybe. as stated they do help the ride quality, if you adjust the air pressure to the load being carried. I have total air ride on the rear of mine, with automatic leveling, it is a little rough empty, but rides like a cadillac pulling my 16k 5er. Do yourself a favor and take them off the old truck and install them on the new one. You don't need them for weight, but you can sure use them for comfort.
03 Silverado cclb 3500 drw, D/A, Reese 22k hitch
07 Alfa SeeYa Gold 30RL,2 slides,power everything