Link to List of All Mobile/Manufactured Home Parks in Sonoma County:

http://www.mhvillage.com/Communities/MobileHomeParks.php?State=CA&County=Sonoma

Parks where you own (rather than rent) the land are:

Santa Rosa - Valle Vista, I & II (55+), and III (all-age)

Parks where some or all of the units have 2-car garages:

Santa Rosa - The Orchard - all units have attached garages

Petaluma - Royal Oaks - a little less than half the units have detached garages