4wd GMT800s should have a 3/16" aluminum plate under the engine / front axle, a glass-nylon chin "plate" and a steel plate under the transfer case. You can possibly pick them up at a salvage yard.
I've been doodling plate ideas for a couple years to serve as a shield for that big hunk of plastic fuel tank. More of a second-skin idea and not something that will take the vehicle weight during a high center.
@Burb One might have built something like it by now.
Thinking about fabbing some plates to shield the rear shock mounts and some sort of frontal protection mounted to the lower control arms for the tie rods / brake lines. But unsprung weight is Bad, mkay. But it's an unprotected area for bashing around the high desert shrubbery or road-crossing animals. But enough about progressive-indoctrinated protesters.