few questions about bags

[Swifty]

Please forgive me if these questions have been answered before. i did a search but i guess i didn't type in the right stuff.

I'm thinking of lowering my 68 long bed dodge 3/4 ton but i have a few worries. I'm completley new to the bagging scene.

I have a straight axel up front and i'm affraid this might cause problems when it comes to bagging it.

I'd like to lay frame but i'm not wanting to cut into anything so i'm just going to try and go as low as possible. How low would i be able to get if i don't cut into my frame? How high could it get when the bags are fully aired?

Will i loose towing ability with the truck since its bagged? Would i also still be able to haul wood, bricks, etc. in the bed without any problems?

Any help is greatly appreciated.