Mispurchasing… funded Golf 6

Hello, due to a job change my parents lack the tractor for their caravan. 1.5 years ago they financed a Golf 6 team (1.4 TSI 122PS) for 18500 euros with a loan from the Volkswagen bank (payment 8900 euros). Because of this additional towing load is not enough, now a new car has to come! The golf was then a new car, so the sale is estimated to be a huge loss business. In addition, just the Golf 7 comes out, which is certainly What would you do? 1) Pay the golf for approx. 12000-13000 Euro from the dealer and buy or finance a suitable car there. or 2) trigger the golf and sell it from private. However, this carries a certain risk, since it is not foreseeable when the car will find a buyer. I guess you would have to put an additional 500 Euro into a paint doctor (Mother & Sisters have immortalized themselves with 2-3 scratches, you know this^^).