This weekend is the Cooper-designated weekend for people who want access to trailers stored there to go in and do any needed work. (There was a second, but it was Shavuot so that didn't help me.) It's been three years since Pennsic was held and thus three years since my house-on-a-trailer has been moved or used. I dreaded what I might find. I wouldn't have been surprised by "sunk into the ground up to its axles and, after digging it out, it needs new tires". I wouldn't have been surprised by exterior damage from other trailers or vehicles hitting it (which has happened before). I was expecting an exterior covered waist-high in mold or algae or whatever lives in those fields, which has happened before.
The two of us and two trailer-savvy people from our camp went up this afternoon, to do what we could and scout what would be needed for a return trip on Sunday. Miracle of miracles: it was fine. The Coopers have mowed the grass in the storage area, the tires are fine (a little low but can be driven; we can top off at Pennsic), the bucket we left inverted over the hitch was still there (so the hitch is fine, no rust), and it was more sound than it has been some years after only one year of sitting.
Whew. I was afraid I was going to have to invest more when we're under an eviction notice already (so I am not interested in long-term fixes at this point, only stopgaps). The one repair I knew I'd need will be fine (and not hard), and everything else looks fine. Pennsic accommodations this year should be sound.