People that have stayed at Dustins Diamond J on the west side of Tucson liked it.
http://www.diamondjrvpark.com/index.html
Benson, which is 30-40 minutes from tucsson shopping is a nice little town with many attractions near it. San Pedro RV
http://sanpedrorv.com/index.htm
and Butterfield RV are both nice parks with much better rates
http://www.rv-resort.com/