I never let my wheels get off the ground when using the leveling jacks and I sure wouldn't put these plastic things under my jacks. That being said, they are supposed to support the weight of a class A or 5th wheel when used under the tires. If I was buying, I would get the yellow ones as they are wide enough for the rear duallies.
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Lt Keefer
2018 Hurricane 29M
CHF, Saf-T-Plus, SumoSprings
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