This is not the first time I've read on MUD that the 100-series rear end has a tendency to want to come around, especially on slippery downhill grades. I haven't driven the LX in snow yet, anyone else here experience this?
No, not really specific to the 100 series. In fact it does better than any vehicle I've driven. But on ice nothing does well, without fresh studded snow tires.
I've driven many different cars in the mountains going up to ski, over past ~45 years. From Datsun 240Z, tiny Datsun pick-ups, GTO, 4 wheel drive Subaru's & Pathfinders' to old Buick's and other rear will drives. The 100 series is far better than any other I've driven even Subaru which is a very good snow car.
I learned to drive in rear wheel non ABS or A-Trick! I don't like that stuff. Driving properly it's never even activates. Biggest problem I have is not pumping brakes. I've often considered putting a kill switch in for ABS. But have just learned to drive so it never comes on.
I've had many terrifying experience driving in Colorado, but never in the 100. I just have to remember to slow down and it's all good.
The most notable (terrifying) was driving a 240Z coming out of Eisenhower tunnel one evening, finding every car in front of me spinning out at ~50 MPH. Over 2 dozen spinning or more, with more in the ditches some over the embankment down the hill. Each one of them I'd see a tap on the brakes (brake lights), then spin. I kept my foot on the gas peddle of my 240Z without a flinch. Threaded the needle, very gently veering (steering) through the spinning cars. Only halve the car following me made it, if that, not one in front of me did.
I carried two heavy sand bag in trunk or over rear wheel and a small shovel, for many years. I've not done that ever with the Land Cruiser.