I can only speak (type) for 2018. We did not have reservations, went on the stand by list in August, and managed to get 2 Fiesta dry sites for Monday - Wednesday, then had to leave. When not in the Fiesta sites, we stayed at the Black Mesa Casino, about 22 miles north of the Fiesta grounds. Electric only sites with fresh water & a dump station for $20.00 per night. First come, and the place was never more than 1/4 filled. Basically a parking lot with electricity.
The drive to the Fiesta was a PIA, lots of traffic, parking fees, long walks or bus rides from the parking lots to the gate, etc but we did stay at the casino both before & after our stint at the Fiesta grounds.
Here is a link to the section of my journal for the start of the Fiesta visit.
