Have you checked for an answer over on IH8MUD in the 100 series section? May find an answer there too.
On the type of chain - real ones, not the cheap cable type. I've carried the chain type in my 80 for years and have never had to put them on outside a test fit when I got them. I've had many checkpoints here in CA ask if I've got them in the truck and let through w/o putting them on being 4WD. I've had two checkpoints close behind me on I-80 up to Tahoe due to blizzard conditions. I was running the stock Michelin LTX tires at the time, so not even snow tires. The Landcruiser did exceptionally well.