We have two 4th gens in the family, both 4x4. One is at 229K miles with regular maintenance only. The other has been driven hard by a teenage, now young adult son and at 310K miles has had an engine rebuild at 200K (overboard decision, it was a head gasket but the price wasn't far off, so I thought I'd buy "insurance" miles...dumb), a transmission rebuild at 280K, a radiator (I think twice...he rammed it around in the desert) and regular maintenance. But the kid crashed it this week and it's a total loss, which is why I'm on here trying to get my 15 posts (lol), but I saw your message and thought I'd share. Good luck! I'm positive the truck chassis saved my kid's life...he walked away with only a tiny scratch on his arm from the airbag deployment after crashing head first into a tree at 55 mph. He clipped a curb and couldn't correct back. I'm buying him another....correction....he's buying himself another!