Can't recall any Flamethrower Shads in the comic... hmmm... Mostly they carried AK47's, even though the toy came with a bazooka.
However, there were tons of artist-created spin offs; Shad divers, Shad canoes, Shad submarines, Space Shads, Shad moonbuggy, Shad moonbase, Shad Helicopters, etc etc
There were also some Cobra designs, particuarly in the finale epic Operation Deep Cover. There's a scene with a Cobra pilot in an A10 Thunderbolt which I believe predates the Rattler.
OK, I'll stop now.