Hi Danattherock:
I bought through the AirSafe website:
AirSafe websiteIf you don't tow a bunch of different trailers like our truck does, I would suggest talking to them about sizing your hitch to your Airstream - main reason is the big trailer capacity units are heavy to lift :) - I have a Class VI model and with a weight distribution coupler bolted to it I could use a skyhook to help pick it up...
When towing you adjust the air pressure per instructions so the dog bone connectors ride just slanted a bit. When the trailer goes to give the tow vehicle (and it's driveline and occupants) a shove (rv world calls it "chucking") the AirSafe compresses absorbing most of that energy.
We have on board air we can use for adjusting the hitch suspension air pressure but it would be just as easy to buy a decent quality hand tire pump for the tiny changes that are needed - due to load, outside temperature, and big changes in altitude. It is not fiddly - if you set it for the trailer once, and don't climb 6000ft in altitude or go from winter to summer in a day it doesn't need a lot of adjusting...
