Hey Rabbit, I done a NADA search on your dads truck. Clean retail on his truck is about 18K. Rought trade-in is about 12K. If they are only offering 10K I'd tell them to go pound sand in thier azz. Clean trade-in is $14,500.
Sounds like this is a real nice truck, I wouldn't take no less than $13,500. JMO.
TS1955