Few questions and a YouTube video

[Bigblock65lwb]

I’m wanting to lower my truck with 2 1/2 drop spindles in the front and have bags in the rear running on a T line with a air inflation valve coming out of my roll pan. No compressor or tank. My question is is there such thing as a leak proof system, and which bags should I run so that I’m not stretching the bag too much if that’s possible. I know 2600 bags extend to like 9” and the titan 2500s extend to 11.5. I don’t want to be so low that I’ll I’m dragging headers just even and be able to throw something in the bed and level it back up. https://youtu.be/b6IwMEQoWx8 Here’s a link to my truck. And does anyone have a picture of their truck running what I’m looking to do? Thanks guys!