The company Netguy tossed out there has a hard rubber mat with Astro turf on the back side to collect stuff. Wondering how good that works out. The company is in Coon Rapids so not far from me, might just go check it out and talk to them.
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I just ordered those for my new truck. I have rock tammers for sale now, I will post them here later on. I never noticed rocks bouncing down off them and back up to my boat, or ice house, nor on to my wheelers when trailered with the hard plastic ones. And my boat, shacks, and wheelrs never got beat up so not so sure on that conclusion. Adjust them so they are almost dragging and you’ll be golden. I would have kept my tammers but they didn’t fit new 2.5 inch hitch