dropping the rear more after installing springs?

Is there anything else i can do do drop the rear of my tahoe?
I already have 5"drop coils..

I know djm sells trailing arm brackets but im not sure what does are meant for

Not much else you can do simple and cheap aside from removing the rubber spring isolators. The trailing arm brackets only relocate the arms to correct the angle.
You could always notch the frame and add bags if you're really determined to go lower. Some places also sell clamps so you can clamp a couple coils together and get it lower that way also.

i guess clamping the springs would give a horrible ride???

are trailing arm brackets necessary?? does everyone run them??

where can i buy a rear kit for airbags? Do i just need 2 bags? do i need brackets and other stuff? I want a simple setup without valves, compressors, tanks, switches...

I just want to have the bags and i can lower/raise them at a gas station with an air pump..

thanks for your help!!