It's only been a week, but what are my options if they do not return and the RV just sits in the slot? 

(We switched to commercial financing when we ran out of loan slots with Fannie Mae.)  

In this case, he gave us ample notice to (most likely) fill that slot, however, I'd like to protect us in the future.

Parking slots, shared parking?

Most seem to want a showing (i am currently making a quick google sheet with available time slots on a Sat morning for my dad to show).

But one can buy a pearl every now and again I suppose kind of like playing the slots looking for that 100k payout :)

Quote from @Huiping S.: Lots families were flooded from Hurricane Helene.

Its surging slot so if you time it right on the buy in (around 10800ish) and the sell (I believe in the next few days it'll steady out at 11300 based on trends last few weeks) it's not too far fetched to net 1000ish as you use the surges to your advantage.

We have 45 RV slots on site.

Another lady said he'll be done in 10 minutes and asked us to wait.  20 minutes later, we interrupted them to let them know we had to leave and to ask if we can reschedule, he gave us a bad attitude, just said he was there at 5pm at our scheduled time, indicating it was our fault that we missed our slot.