2500 "light duty" and also a 4x4, don't see too many of those down here - most of the 2500LD's I see are RWD. Either way yes has the stronger 14 bolt 9.5" SF rear and an extra leaf in the pack.
Those wheels are regular issue K1500 wheels that were available in 1991, not sure how may other years, before they switched to the sawblade design. Not a very common wheel. Be careful with the black plastic fake lug caps that thread onto the real lugs as they're unique to the wheels - cylinder shape with no flange to hold down a center cap, like most of the other designs.
Had a '91 K1500 parts truck with those wheels..
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Richard