car insurance equity

Is it difficult to trade in a vehicle with neg. equity for a cheaper car to reduce payments.?
I have a Toyota Highlander 2006 and my payments are 637.00 per month. was at a price of 27,500.00 and I had to get a loan of 38,000.00. So thats at 10,500.00 neg. equity! I made the purchase of insurance Gap. My credit is fair. Is it possible to replace it with a cheaper car to get lower payments?
in two words, probably not.
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