lets see here every truck is going to have difference stuff brake a Different times depending on the weather, how you drive it if your in salt or not. the biggest i had was my idler pulley bearing froze. I have replaced my idler pulley 3 times and my tensior pulley 3 times I am getting sick of it now.
304k and still pulling 3000lbs+! Routine maint. to 250K. Since have replaced head,260K, clutch & slave cylinder 301K rear axle 257K, U-joints 200K Last November trip from Fla to Ma and back no problems (gross weight on return trip only 7780!)