We just returned from a wine trip to the area and live in Phoenix as well. We stayed a few nights at Vines RV Park in Paso Robles and then headed south to Flying Flags RV in Buellton.
Paso Robles has over 250 wineries. The town is rather small but has some excellent one of a kind restaurants and pubs. We prefer Vines RV over Wine Country RV. Vines is rather new and very nice but Wine Country is also decent.
Buellton area also has numerous wineries especially Pinot Noir. Between Paso and Buellton near Pismo Beach and San Luis Obisbo is Edna Valley wine region with some excellent wineries. Also in the area just north of Buellton is the Foxen wine trail with more wineries such as Cambria and Fess Parker.
Just down the road from Buellton is the Swiss town of Solvang. Very fun place to visit. The Wineries around Buellton and Solvang were featured in the movie Sideways.
