I'm curious if it's possible to add the factory air suspension to my 2010 Expy EB? I know there are after market options out there, but I'm just curious if the factory kit could be added without breaking the bank? Anyone ever gone that route? Speaking of aftermarket, for some reason 2010 seems to be an odd year and many air-bag lift sites don't offer or make clear what kit will work with my model. Anybody add a bag lift kit to their 2010?