When I was looking for campgrounds in the DL area about 2 years ago I found this info. I don't know if it's still current so you'll have to give them a call.
Orangeland Recreational Vehicle Park, Inc.
at Katella Avenue in Orange, 1600 W. Struck Ave., Orange 92867.
714/633-0414, fax: 714/633-9012.
Orangeland is situated among orange trees to provide you with shade and a
quiet, restful atmosphere; yet centrally located near five freeways and 5
minutes east of
Disneyland. 212 paved, landscaped sites, full hookups -
20/30/50 amps, all tile bathrooms, complete store, laundry, pool and spa,
club room with kitchen, shuffleboard courts, children's playground and
exercise room. Rates by day or month.