The scale, given Revell's history, often gets mixed up. I could see the 'Jimmy High Roller' being a reissue of the Monogram Jimmy (that hasn't been seen in a long time) with the High Roller suspension (a version Monogram never did). But, it is listed as an '85 which is different enough from the '75 that the Monogram Jimmy kit is that I dare say they would not make that mistake. So, my bet would be a GMC version of the Stranger Things Blazer with a new suspension and wheels.
As for the '78 Chevy and go cart, that could conceivably be a version of the Monogram Chevy truck with the old Revell Honda Odyssey (off-road vehicle, not minivan!).