that often times depends. if you add up your bills on the truck over the year and it adds up to a newer or new truck payment, why are you keeping it around other than sentimental value?
I also dont really believe in the "high mileage means unreliable for long distance runs" but i am pretty rigorous about maintenance on my truck and make sure things are as they should be. I also carry spare parts known to leave you on the side of the road and tools to fix them as well as fix other issues should they arise. Even if i had a brand new truck, id still have some key parts, EFI Live and tools on me to keep the fam and me from sitting on the side of the road. in the 201K my truck chassis has on it, its left us on the side of the road twice. Once when my dad just bought it and we were headed to Pismo beach from AZ in 2002. we got just outside of LA fighting traffic when the return line fitting that uses the 3/8" quick connect came apart (pushed the hose right off the end of the fitting, really strange). Brand new truck and still had an issue that left us out waiting on a tow with a 40ft 5th wheel to figure out how to get to the dealer as well. last time was coming back from Denver, lost a wheel bearing and my spare was at home. Quick tow into a napa and i fixed it in the parking lot. Still made it home in 14 hours (normally a 12 hour trip). No trailer on me that time
i see both sides but a high mileage truck wouldnt bother me other than the lack of resale value. The Limo is just sentimental, i still cant give her up