Have you ever been to Mountain View or the surrounding area?
Mountain View is a funny mix of neighborhoods. Some are pretty bad. I personally would not consider living in a mobile home in the parks you cite. Please drive around them if you have not done so.
Good luck finding much for rent in that area in a decent neighborhood for under $2,000. The rental website you mention has a lot of rents from two years ago. Lots of those complexes are not in great areas.
Any condo listed under $400,000 is in an apartment building conversion from the 1960's or 1970's.
Space rents look to be in the mid $800's, based on the current for sale mobile home listings. You will have to pay property taxes on the mobile home, unless it is old enough to be licensed by the DMV.
Zillow is useless. The listings you cite are already pending. For more current for sale and for rent information, go to
www.mlslistings.com. Put in Mountain View and see what comes up. There were no active single family listings when I searched under $750,000. Well, there's one that's being sold for land value....
You are going to have to up your housing budget or be prepared to commute a significant distance. That's the price you pay to move to Silicon Valley.