I have zero clue on the total miles. It's got 85k on an overhaul without paperwork. New front rear end. New air compressor as of 2/23/20.
This truck was featured in the ending scene of the motion picture Bumblebee, so it is the legitimate Optimus Prime.
Ok, now here's what it needs: new driver's side door, some fenders, lower section of the grill.
The statement of the paintjob not being stellar also gave me a good chuckle. It seems truck fans and transformers toys fans have quite a bit in common.
You can find the listing here.

can design Optimus Prime just fine (mostly), it is
that doesn't much care to do OP justice, in terms of toy concepts/designs AND character consistency especially during the Bayverse-era at least.