For $500 you can't beat it. A working dump bed, no less.
I'll bet you get the engine running, too without a lot of fuss.
Are you planning to restore it? Get it roadworthy and drive it as-is? Hot rod it?
And no, your 2020 GMC will not survive for 72 years. The electronics will be long dead and nobody will be making replacements. Heck, car makers don't even make parts for their own vehicles after 10 years - sometimes even less.