I've done tires (7.50x20 for a trailer next time I'll just outsource the removal to the tire shop, paint the rims and come back...) and stall mats for horses. Those are circa 3/4" thick. You're two options, and each work in their own way is the utility knife or a reciprocating saw. The utility knife seems daunting at first and you think it'll take forever, but you'll be surprised how fast you can cut the rubber. The other way is to use a sawsall, jig-saw or similar at slow speed. As mentioned previously heat is your enemy here.
Matt
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