A windfall like this doesn't necessarily happen every day. You've got an opportunity here to get out of debt. I'd sell the Colorado, then use that money to pay down the note on the current truck. You'll easily be in a positive equity position at that point, so it will then be your decision whether to sell the truck and pay off the balance, then buy something else, or keep the truck and finish the balance of payments.
If it were me, I'd get debt to zero ASAP. Lately, I've been looking at doing a 302 and Borg Warner T5 setup in a Fairmont 4-door, so I'm inclined to recommend something that doesn't carry a car payment. Buy hey, to each their own.