In the Portal page, at the right hand side scroll down the page and you'll find "Airstream Inspectors." Select the state and the unit type and it'll give you a list.
I sort the list by how recently the person was active on the forums, then look for an active person who's conveniently close to where the trailer is located. Remember that if the trailer is located near a state line, there might be someone who's close but in the neighboring state, so you'll have to do a new search to check that.
Il Carriaggio — 1975 Argosy 24 | Il Progetto — 1976 Argosy 28 Center Bath | WBCCI# 15566
He has all of the virtues I dislike and none of the vices I admire. — Sir Winston Churchill