My 2000 Suburban is the same size as 2025 Toyota Tacoma, the smaller of the Toyota pickups. The Tacoma is wider and taller, but the Surbuban is a bit longer. Just making cars bigger seems to be the automakers’ primary way of updating cars.
I think this is the primary reason the value of the GMT800 based trucks have gone up. They’re modern enough that you can put a cheap OBDII scanner on them and find out what is wrong, but old enough that you don’t need a dealership computer to program any parts you do replace.
Mechanical parts are readily available, though less so for trim pieces, and there is a big aftermarket if you want to customize or add go fast parts.