You can generally guess where the truck is going after having it for a few years. Some things to consider:

Is the ride quality degenerating?
Is the engine using oil?
Is wind noise still at a minimal?
How hard has it been driven?
Has it had regular maintenance?

Basically, the things I look for are trends, downward trends such as decreasing gas mileage, increasing oil usage, plastic breaking off, and things becoming lose. If this is one of those which started life with dino oil and switched to synthetic, I'd monitor oil usage a lot more carefully. If it's even close to using a quart of oil every 5k miles I'd get rid of it.

Kuan