I didn't ask you whether you were a new first time Airstream owner or not. Obviously if you are new then you potentially may be able to join at no cost. The $10 issue may be regarding the local chapter dues. Some chapter's waive their side of the dues for new members who are purchasing their first Airstream, others may not, hence the $10 charge.
Hopfully that eliminates most of the issues.
'04 Classic 30' S.O.,'03 GMC Savana 2500,'14 Honda CTX 700