air hose on a service body

on my service truck i have upgraded my air compressor and welder to a 302 air pack and I'm also adding a 12 volt air compressor to keep the tank full for an air horn. adding one more air tank to the truck too.

i have to redo all the air lines on the truck and was wondering what hose or piping is the best to use.

thanks joe

air hose on a service body