Generation II stompers are still Schaper stompers, but they underwent a redesign, as did the packaging, for the the 1983 toy year.
They had 3 settings: off, low (for climbing), and high (for speed) (see pic, notice the sliding bar in the middle that controls the speed). Gen II had rubber tires that were about 1/2" wide. The bumpers were moved to the cover instead of the base. ( see pics of misc stompers ).
Some Gen IIs came with stunt wheels which was a fifth wheel that attached to the bottom of the stomper so it could drive on only two other wheels. Click here for a Gen II with stunt wheel attached, and here is a stunt wheel closeup.
Work x 4's came back for Gen II, but now they are on the new modified platform. Both Generations included a dump truck and a cement mixer, I'm not sure if the others are in both sets.
Wilderness Campers came out in 1983, each of the 3 models could come with an optional small trailer. In 1984, it was expanded to 5 models, each with two different colors. A real working winch was added and the trailers became standard, so the name was changed to Workhorses.
The Road Rods of 1983 included a Porsche, a VW Bug, a Subaru Brat, a Bronco, a truck, and a chevy van. In 1984, Schaper took it up a notch and created the Custom Kit and the Deluxe Custom Kit. The kit includes one base, 2 bodies, and 3 sets of tires (deluxe is basically doubled this, except one motor is standard and the other motor is high powered). Both the van and the truck disappeared in this 1984 release.
1983 also saw the introduction of the Heavy Haulers. They are based on the Semi platform, so that means they are 10 wheel drive stompers that required 2 AAs. Stomper Semis became Stomper "Road Kings" Semis.
We even saw the introduction of Water Demons! in 1983. This was a set of six amphibious vehicles.
The stompers were slightly modified for a series called Speedsters in 1985. The tires were flat and a steering mechanism was added so that they could follow "Twistrack".
1985 also introduced us to Future Force (#605). The Guardians (space lawmen) are trying the good people of Humanium take their planet back from the evil Destroyer troops. This lineup pits two Guardian vehicles (defensive guardram and mobile outpost) vs the two Destroyer vehicles (crusher and launcher).
1985: Stomper Overdrives (#905) were oversized stompers that had an "over-running clutch mechanism [that ]allows the wheels to "overrun" the gear for free-wheeling downhill acceleration". There were four models.
1985: Stomper Zanees - I have no words (but here's a picture).
1986 introduced Trendsetters (#866). "Tomorrow's cars... you can have them today... with Stomper Trendsetters. Vehicles with bold new styling." That said, I just spent an hour tracking down a bunch of Trendsetters pictures and they seem to be the same Stomper molds that they've always used for the most part. The lineup included a Ford F100, a Ford Baja truck, a GMC Turbo truck (1 red, 1 green), a Bronco II, an AMC Eagle, a suped up Dodge Van, a Cherokee Chief (1 black, 1 yellow), a dune buggy, a tractor puller, a Merkur... and a Duesenberg!
1986 also gave us MEGA STAR. There were four components to the set: Trans Patrol, Aqua Fighters, Super Force, and Quad Climbers.
On Sept 5th, 1986, Tyco Toys acquireed Schaper Toys from Kusan, Inc. (a href=https://www.upi.com/Archives/1986/09/05/Tyco-agrees-to-buy-Schaper/5490526276800/ target=_new>Press release here). [for Reference, Kusan had been sold by it's parent company, Bethlehem Steel Corp, in June]