We are on a rented RV lot in the Foothills right know, there is a lot of availability but some landlords may only want long stay folks. With the high vacancy rate you may be lucky though.
We were over at Fortuna do Oro RV park visiting some friends a week or so ago, there were hundreds of empty spaces at that time. The tranient area is a little bleak (sand and gravel) but there is good space between sites and they have full services and concrete patio pads. The park is located on north Frontage road just east of Foothills Blvd.
The park has been bought by Cal Am resorts and they are putting lots of $$ into it to improve the place.
Fortuna