well, you have to know going into any purchase (even a house at times) it is going to lose at least 15% of it's value as soon as it's used and the value will be higher the sooner you try to resell the unit. If I were you I'd be driving that thing till it dies, remember, you can look at it like this, that truck should go a easy 125K miles w/o a major failure, 125K you'll be paid off and everything will be gravy for the down payment.