J.W.
Go online with Google and search for RV parks and Suisun California. Then call them. Contact the Chamber of Commerce for that area and ask their advice. Call the law enforcement agency for that area, explain your needs and circumstances and ask for their advice. I don't think it matters what town, city or area you visit, the elderly are always targets for theft and scams, becasue they can't fight back. Just being aware of your location is the first major step. You wouldn't leave your young kids alone, so don't leave your elderly parents alone in some place they don't know. Places like Thousand Trails have rv parks all around the country and they provide a minimal amount of security for their parks, you can't get in unless you're a resident/guest. AAA might also be another place to check as well as AARP for recommendations for places to stay. Have a great trip!!!