There are a few RV parks on Mission Bay that offer extended stay rates, however as for "free" or inexpensive, probably none available. The parks on Mission Bay are on the bus route to the downtown area and are close to shopping. If you go further out, there is the trolley that will take you close to downtown.
Recommend doing a web search of RV parks in the San Diego area, which should give you a clearer picture of what is available, prices, etc.
Bob
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2008 Gulf Stream Tour Master T40B 330 Mercedes
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