Seems folks are missing the point. At any rate the OM excerpt from @Mr Nick is interesting. It would be great if it worked and was adaptable to older models.
I used some RCs that came with the bumper.
The only unique thing was I took power from the rear 12v outlet so it would have the time delay to use as camp lights.
I haven't used chains on road in 50 years, but off road have made go/no go possible more than I can count. No hotels where I might use them and I'd have to wait until spring.
If the 4wd clutch requires power to stay disengaged it would explain a lot, you would think it would default to disengaged however.
Apparently the output of the transmission sling some oil since we've never heard of a failure with a manual.
Road trip: Clothing appropriate for the potential exterior weather. It amazes me the folks who will venture out in the world with nothing but a tee shirt, basketball shorts and flip flops as if they will always be in a climate controlled environment.
Off Road trip: Tire chains. Yep, they can...
I don't have direct experience to answer your question, but: Many folks use Ford OEM and aftermarket bumper shackle mounts to flat tow. Assuming the welds are good and you have the frame horn reinforcements I'd say your good as far as strength. One concern I have from the photos is you may...