What am I going to be looking at price wise (rear bags)

[Hotrod70C10]

OK here's the deal, I have a 70' lwb fleet pickup with 2 1/2" drop spindles (disc brakes of coarse), 1 1/2" drop springs in front also and, 4" drop springs in the back for a total of 4/4 drop. I'm considering putting in some 5" or 6" drop springs to drop the rear a bit more but, my problem is I don't want my truck to be totally useless as a truck. I say this because I am not going to C-notch the frame. That is why I am starting to look into a rear bag setup. I don't want anything crazy, just two bags a small air tank and small compressor. I'm not interested in air out and air in speed or how many times I can go up and down before I have to fill the tank. This is mainly because I want to have some load handling capability when I use my truck as a truck. Can anyone help me out? I hope that covers everything if not, let me know what else you need to know. Thanks, Billy