Couple ?? for your airbag guys

[randomhero472]

I'm trying to finalize my parts list and get the rest of my stuff ordered, have a couple quesitons:
1) how many of you are running inline water seperators? or inline oilers??
2) anyone know if a 5 gallon tank can be mounted on the frame rail (in between frame/bedisde), im planning on doing (2) 3 gallon tanks, 1 on each side, but would like to see it i could make just (1) 5 gallon tank work, also anyone know the measurement between the outside frame rail and the inside bed side on a fleetside, in-front of the rear wheel?
3) where can you buy GOOD fittings, my bro-in law works @ frieghtliner, i would think they'd have fittings, but unsure.. i know no matter how well i think i've got the fittings list when i get them here im sure i'll be needing some odd-in's, but we dont exactly have a local suicide-doors shop here in okc, thanks guys!