I purchased the bed weight for more traction. My truck is rear wheel drive and every time I go over these train tracks near my house I can feel the back half lift off the ground and shift over. I put it to the test. Sure enough the weight helped my rear wheels stay on the ground and keep traction. I'm looking forwards to this winter for the next test.If you are questioning which size to get the 400lbs fits perfect for medium sized beds. I highly recommend this product.
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