Suburban on semi chassis - photo

[Frank S]

Since they used the GMC logo, it'd be a Yukon XL, not a Suburban. (same sheet metal, either way)

up until sometime in the late 90s both brands were Suburban
A company I was with had an 89 3/4ton GMC suburban 454 V8 4 sp automatic when towing a 14,000 lb trailer it got 12MPG as opposed to my 89 Dodge with the 5.9 cummins with a mechanics bed loaded down would average better than 17 pulling the same load on the same trailer