I think you’re correct on all counts.
I’ve done similar this summer and have never been busier. Covid has brought about more closer to home vacations. You’re listing provides a unique experience for those who need some open space away from their SoCal apartments.
I initially just upped my Friday, Saturday, Sunday prices, to gage how things would fare; after I saw that things were still booking I upped my weekday prices … And still, they come in the hottest summer in Phoenix on record.
PS. If there was one thing that I think could make a bigger difference to your bookings and justify raising prices even further it would be some type of outdoor tub or pool. Granted it requires more maintenance but with the heatwave, I see it being a big incentive. I saw these in AirBNB properties in Joshua Tree and I thought they seemed to mesh well with the Airstream and uniqueness of your property.