For long trips it sounds like your truck is ready to go! No rust and regular maintenance is the biggest plus and maybe the only weak link might be the tires at 4 years old but depending on the miles, Michelins can get 60k. For me if regular maintenance is done and the AC, tires and brakes are good I wouldn’t worry about putting on the miles on a long trip.
That said, I like the safety features, adaptive cruise, 360 cameras, ventilated/heated seats, panaramic sunroof, 12 way adjustable seats and heads up display on my 2024 Tahoe with air suspension and magnetic ride.
Either one can easily make the trip but it comes down to personal preference.
Some might say the newer trucks are expensive, some say it’s worth it!