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You just put more stress on the tailgate. By adding the spacer, your spare now has more leverage against an already taxed tailgate. With a stock size tire 32" tire and aftermarket wheel, this will work in a pinch. I would not recommend it for a larger tire or for someone that may bottom out their tire on a ledge. Even backing up into something lightly will take out that rear gate.
This is a temporary solution only if your tire can rest on the bumper to remove some of the weight and stress. This was quickly done away with when we upgraded to the AEV rear tire carrier and bumper.