I am currently running a 40 dry shot out of 1 pound bottle. I originally went with 1 pound bottle because I I didn't want any1 to know I had it. I was able to get it under the passenger seat no hump.Now most of my friends know so I don't care anymore. I want to add a 2 or 2.5 bottle on frame. Is there a system that allows me to run 2 bottles? So both bottles can contribute to the 40 shot or where I can use the 2.5 and be able to switch to the 1 pound as a reserve on the fly?