It would be five stars if the ramp blocks could snap into place. Using it on gravel can cause parts of the block base to warp, making it difficult to connect. After removing the stuck gravel, you can fix the stack again with a hair dryer or a heat gun in order to compensate for any deformations.
All-season Goodyear Vector 4Seasons Gen-2 Tires 195/65 R15 91H
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