You're right at the tipping point. Drive it much longer and you'll probably need to just keep it till the wheels fall off. Right now you probably have had it long enough to feel like you got your moneys worth and it will still bring a good amount at trade. To me it would come down to how much you like the current truck. I have no problem using a new truck for hunting. I buy them to use.
In 2002 I bought a new 4X4 F-150 Super-Crew. I liked the truck, but didn't love it. Made the mistake of buying one with the smaller 4.6 V8 and it was under powered. I lived with it till I got to about the same point. It had been paid off for a while, but still worth enough for me to justify trading.
I still love the 07 Tacoma as much as I did 160,000 miles ago. I'm at the point where it is worth more for me to keep than it is worth on trade. I plan to run it to at least 200,000 miles and then buy something. I'll probably keep it as a 3rd vehicle rather than trade. Just have to wait and see.
