Rents fluctuate from one park to another. If a park is in a rent controlled area i.e. Escondido, Oceanside (albeit Oceanside is about to lift rent control), etc you will fine rent rates much cheaper. If your coastal i.e. Encinitas, Carlsbad, etc. they will be upwards of 700 dollars per month. If there in cities like Vista, San Marcos, Escondido you can find some parks still under $500/mth but they're usually in a pretty bad part of town or the parks are not very nicely maintained. Your better maintained parks will cost more obviously.
But before you purchase any manufactured home that sits on piers and pads you should definitely get a home inspection done by an experienced manufactured home inspector and not just any home inspector.
They should thoroughly check your understructure to make sure the home is level and the pier jacks and wood pads are in good shape and securely placed in the right locations and tight and that the home is level.
Also make sure they check for rips or tears in your vapor barrier, aks varment barrier. Rodents and critters love to nest in this plenum and rats have been known to eat wiring. Make sure there's no drainage, dampness or mold issues.
Finally make sure the home has a Housing and Community Development (HCD) approved Earthquake Resistant Bracing System (ERBS) system under it as the entire desert area is in a Zone 4 seismic area which is the highest risk catagory.
If you have any other questions or concerns please feel free to contact us at email@example.com or you can call me anytime at 760 815-6977. We do not perform home inspections as that would be a conflict of interest inasmuch as we are a Manufactured Home Contractor, Dealer and real estate broker. But we would be happy to refer you to a reliable MH inspector in the Palm Desert area. Good Luck.