I do not have an onboard or bags, have given it some thought but haven't jumped yet. I've read threads where posters have run several features with on board air: bags, air horns, a chuck for external use (tires, floats...). Usually this type of setup will use a tank and a compressor suited for 50% or higher duty cycle. All the features will drive the $$ up and it looks like it'd be easy to spend $1000 without installation.
2013 F-350 CC SB 2WD 6.7PS
2013 Eagle Premier 351 RLTS
-SOLD- 2012 X23B
-SOLD- 2003 Ford Expedition 5.4, Bilstein shocks