I'm planning on traveling for 6months - 1.5 years (no idea how long yet) and I don't know what to do with my car I was going to drive it from San Diego to Seattle and let my sister use it the entire time I was gone, but insurance companies said that I would have to cancel my California policy, register the vehicle in the state of Washington, and open a new policy with her as the primary driver and myself as the registered owner. Based on her age etc, the policy would jump $140 a month, which is more than she is willing to pay. 

I have no place to leave in in California, and closest family lives in the Midwest, which isn't a drive I'm willing to make. Shipping it from the Midwest to CA two years ago cost ~1,500, which also seems like a waste. 

Aside from actually selling it, what have others done with their cars?