Hi Lynn....I would recomend San Carlos Sonora, it is about 240 Mls. south of Nogales, the Totonaka RV Park has full Hooh-ups, wifi and is very close to Guaymas a city that has a Walmart and Sam Club......it is a easy one day drive from Nogales just start early from Nogales to get your TIP.....temporary importation permit at Km. 21....
Kino Bay 60 miles west of Hermosillo same distance as San Carlos many RV Parks with full Hook-ups this is a mall town but greas slow easy going place with a beautiful beach....
Rocky Point will be your other destination there are plenaty of information on this place on this forum, many RV Parks.....closer of all to Arizona and requires no TIP.....
So I recomend to get on the web and check....San Carlos Sonora
Kino Bay Sonora
Puerto Peniasco Sonora.