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What size rims are you trying to put the tires on?
According to my book, Grand Cherokee's with 15" rims were 7" wide. A P215/75R15 has an allowable rim width of 5 1/2" to 7". That should mean the tire would be at the limit of its stretching ability.
Try a 2 X4 wedged sideways about 3 around the circumference ought to do it. BTW, you want to store these where it is warm while the 2X4's are in there.
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