Here's a quick history of Revell's 1/16 scale '76-ish Chevy Scottsdale Stepside 4x4 kits they've released over the years:
1) I think this "Chevy Off-Road Pickup" is the original release, but not totally sure. The truck is pretty much a scaled up version of Revell's '76 Chevy Stepside pickup, but the 1/16 version is 4WD, with solid axles and leaf springs at all four corners, and rides on generic 8-spoke chrome "wagon" wheels and 15" Mickey Thompson Baja King off-road tires. A 1/16 scale Suzuki 250-ish cc dirtbike was also included having styrene knobby tires and consisting of fifteen or so pieces.
2) The first reissue was the "Baja Fever", which appears to be a straight reissue, except for different decals, plastic color. and the lack of chrome plated parts.
3) I think the "Mountain Crusier" was released by Revell-AG, but again, i appears to be a straight reissue, minus the chromes parts and with new decals and plastic color.
4) At some point, the kit was revised, and a new front valence panel replaced the bumper, a camper shell/topper, smaller brush guard, cross-lace mesh grille, and turbine wheels appeared, and the motorcycle disappeared for good.
5) Revell jumped into the '80s monster truck craze with both feet and modified the kit into the "Swamp Monster" monster truck, selling thousands of kits to 10-13 year old boys (guilty!) in the '84-'87 time period. The original Swamp monster modified reissue, kit #7441, released in 1984 when Revell was owned by Ceji, was molded in black.
6) The Swamp Monster kt was reissued in the early '90s(?), this time molded in hot pink plastic.
7) The second (third?) monster truck version to be released during the Ceji-era was the "Giant Tracks", which seems to contain the camper shell, valence panel, and brush guard from the modified reissues.