I'd like to thank everyone for the great responses---even the wiseguy ones.
My error regarding the year/model/size of the Loudermilks' trailer stemmed from the fact the book I'm adapting for television was actually published way back in 1994, so my memory is vague regarding the model year I chose for their 24-foot Excella. That info was accurate at the time, but as I want to bring the Loudermilks' story into the present in my script, I'll obviously have to update it.
I want to assure you all that I hold the Airstream brand in the highest regard and intend to get all the details relevant to the Loudermilks' experience as Airstream full-timers right. I came here for answers because I know Airstream owners like yourselves a) take this stuff very seriously and b) know their trailers inside out, and I can't very well portray Joe as a proud, card-carrying member of the Wally Byam Caravan Club if I myself can't write about the brand fairly and accurately.
Having said all that, however, this is a comedy-drama for television I'm writing, so some of the police procedural stuff is going to be a little on the unrealistic side. This ain't Masterpiece Theater, in other words.
Still, if this thing ever makes it to the airwaves, I promise not to embarrass anyone who, like Joe, calls an Airstream trailer their "home."