When I met my now wife, she had a 03 ss that had 256k on it. She was not the original owner and did not know how many he owned before her. We’re from Minnesota so it was a little rusty but the thing ran like new. Never left her stranded, she took it on over night work trips to different states and really enjoyed the truck. She sold it in the mid 260’s to get a vehicle that got better economy. The truck had for sure been cared for and maintained.
Earlier this summer I sold my 03 I picked up after always wanting one and being teased by driving hers. This one has just over 100k, despite its near mint appearance, It proved have had a rough life, I did not have the check book to get it back to totally reliability so I sold it.
it sounds to me like yours could go on to live a life like the truck my wife had. These trucks go and go and go when maintained correctly