Welcome to the forums and congrats on getting in on the Airstream fun! Glad you could join in...
We take frequent extended weekend and week+ trips for pleasure...I own my own busienss as well, and have found that with the right internet connect equipment I am able to function on the road much like I function in my home studio... I'm not sure if you can make a case for your AS to be a mobile office...unless you are required to travel as part of your work (which puts a whole new light on matters...talk to your accountant or tax person), but you can definitely deduct interest (as a second home) and you can deduct any equipment or services that make it possible to conduct business on the road (cell phone & service, air card & service, lap top, etc, etc...) If you full time in your AS you can no doubt deduct a portion of expenses, utilties, etc, just as you can with an office in a wheel-less home.
TB & Greg and Abbey Schnauzer
AirForums #21900 . Membership Chair & PastPrez, 4CU/WBCCI #3954
Travel Log: AZBambi...On the Road Again