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The supercharger belts wear out a lot quicker than the other belts. I had the 1st generation supercharger (grey one) and I had one snap while driving down the freeway. It only had around 50,000 miles on the belt. I don't know exactly why, but they tend to weaken easier. I don't know the 2nd gen charger (black) improved upon this. Plus most places don't carry a supercharger belt. I broke my belt in the middle of nowhere, but luckily I had the belt with me. It's just a safety precaution.
That supercharger will not fit on a land cruiser....