Well Man... I know the decision is wrenching for sure, I have struggled with the ideas like you have.. I bought my 12 burb with 97k 1.5 years ago, she is sitting at 121k now... I paid it off a year ago as of now... Back story I have had car payments 28 out of the last 20 years, so take this for what its worth.... So I financed a small amount and knocked it out quick... The first 10 months with no payment is amazing...I started looking around when she rolled 120k... looked at a Tahoe, few escalades, new yukons… All very nice vehicles, controls are nice in the new ones, but is it worth 25k difference in my driver now? Yeah less miles is nice, but I got tired of buying extended warranty on vehicles and put the money in the bank... 5k sitting collecting interest MY way, vs the "Warranty" way is a nice extra dinner a year with the family. 5k will cover anything... Motor, trans, axle, most everything that would go wrong.
My advice.. Take a year off, screw buying new man... 2 years lets that initial depreciation bomb drop fast... But think about it, you have a truck you ordered, your specifications, You have the wifes if you ever want to spice the drive up, but why not sock some money away, you can walk into the dealer in 2 years, with a gob of cash and your ride and walk out, owning a newer vehicle if its what you want but own it outright...
But Im at about double your mileage... You just threw down some change on great parts for yours... Get your money worth out of the parts...…. Cause no dealer will care about bilsteins on a vehicle... or extra goodies.