Same at local dealer except it is for sale, $65k IIRC, an import from Columbia.Local Toyota dealer has one displayed . Mint condition . NOT for sale .
Mid 70's. Serious off roader.
Split rings. different than a split rimNice. It has split rims, or they could be just replicas which are not actually split rims.
Definitely a late '70s–early '80s US–spec model. Those were the normal rear bumpers in the US market because trucks, as you said, did not have to meet the car bumper standards. Not just Chevrolet, but almost every pickup manufacturer made available base-model pickups without rear bumpers at the time.The lack of a proper rear bumper would suggest it's an import but if I'm not mistaken, "trucks" weren't regulated on safety aspects like automobiles, hence Chevy used to sell pick-up trucks with NO rear bumper (especially S-10s).
Split rings. different than a split rim