do you live by your STR and offer a private car service to guests for an additional fee?...

I know nothing about wholesaling, but it sounds like to me you need to just pull a small trigger.

On Airbnb you click different dates and you will see how high the occupancy is, how much the total gross amount is, minus management, minus tax, utilities and airbnb fees and you will see if the amount netting is about what you expect. 

The high fees on platforms, less recreational travelers vs. more business travelers, and the cost of cleaning are really pushing me to explore mid-term rentals more.

It’s also increasingly harder these days to pull out 100% of your money.

This means that you will probably need to pay registration and filing fees in at least 2 states if you don’t buy CA property as a CA resident.Be sure to tell your accountant that you may now need to file non-resident income tax returns in each state where you own property as well.

Just be careful that those referral fees don't violate RESPA. 

No showings, no cleanings, no fees.

They retroactively applied increased property tax values to tax years 2021 and 2022 and included these fees for past years as "omitted taxes" on our bill. 

As rates are coming down....a number of those have been pulled from the market and work has started on them.