You can call or email me and I'll set up a daily email alert for all new mobile listings with your criteria/must haves.  Here's a few of my "go to" search engines for mobile home searches

MetroList - The largest MLS in Northern California and specifically Sacramento Region

Zillow - Mobile Home Search (Set up for California--you can refine the area once you get to the link)

Realtor.om Mobile Home Search (Set up for California - you can refine the area once you get to the link)