Is it possible to finance a $23K trailer for 180 months?

We just purchased our travel trailer and got a much better rate than that. We shopped around for a couple lenders, got preapproved through our bank and the dealer was able to get a another .25% off. We financed for 144 months to get the interest rate (longer term = lower rate), put a sizable down payment, and will be sending in almost double the scheduled payment amount. We will end up paying the loan off in ~5 years as opposed to 12 years.