It has been 5 years but we stayed at Sunflower Rv Resort at Surprise/ElMirage.
http://www.cal-am.com/resorts/resort...?resorts_id=14 Little pricey back then but had great amenities and nice people staying in the park. We weren't outsiders for very long following our arrivial. We loved the location as it was close to several of the spring training parks. In picking your park just remember it is a long way and a tough commute from Mesa to the West side of the valley. Decide which ball parks you want to visit then pick your RV park. We love spring training baseball. Jim