I recently purchased a 2005 tundra. Little did I know when purchasing this truck that a previous owner had outfitted the rear end with airbags. Not that I am upset about this however I have no idea how to fill the bags or let air out of them. What kind of compressor do I need and is there a special fitting for the fill nipple. Help! any will do at this point.

PS I have googled the topic with little success.