If I counted right, the Quartzsite Chamber of Commerce website ( http://www.quartzsitebusinesschamber.com/camp.htm ) lists 56 RV parks in Quartzsite. All of these are full hookup parks.
Why don't you find them in the campground guide? Simple - they fill up quite nicely during the winter months without having to pay for a listing in the guides.
The weather is about the same as in the Phoenix valley.