Zeons,
I think it was the side tread that the BFG's had that helped keep the slipping down.
Stronger tires (3 ply sidewall) also do better/safer when aired down which also helps with traction on slippery things including snow and ice.
The other thing that makes a difference is the driver. In Uwharrie it is often very slick when it's rained due to the type of red clay in the soil. My friend with his new disco in totally stock form had the basic street/all season tires and was so jazed to go so we just went in the rain. He disappeared from my mirror for a while so we went back and he couldn't get up this little hill thing so I drove it over for him to his amazement. I learned in my 96 disco though on the Michelin xpc tires (one of my favorite tires of all time due to the nice ride, wear, and all around decent traction in snow and basic mud. Momentum is the key though when traction is limited in other ways.
He also annoyingly left his darn running boards on despite me telling him to remove them first (they got all sorts of f-d up that day and mostly removed themselves)
So, another reason to have a strong safe tire off road, especially when alone, is to close as many variables as possible. That cut I got that day would have shredded a thinner sidewall instantly. I only got rid of it because Discount Tire credited nearly the whole cost.
I don't know why we're still debating tire nuances in side wall height and C vs D. Isn't an E rating really the best for LR3's, especially when you start adding a bunch of steel and other weight?? It shouldn't matter what they cost because it isn't like any contenders are going to save much $ really. If they supposedly ride slightly firmer on the highway, well, so what, the air ride negates all that.
Most guys I know of running their heavier G wagons through the same situations also use the BFG but they get to toss on bigger sizes than ours without a lift so it's a little unfair. It's about all I see them on though and that's from all over the world. Some choose mt's but again, sizes and makes we can't fit.