I have looked at a lot of different hangar space lease agreements at several airports. Mostl have a clause that says only airplanes and other aviation related storage. Then when you walk down hangar row you see campers, boats, hot rods and other cool stuff along with an airplane. Do they just have this verbiage in the lease to make the FAA happy and tell you with a wink that it is enforced.
What airports actually enforce this. Oregon is pretty loose. They can get picky in Northern California but not too bad in Siskiyou County. What is Idaho like.

