you could get some rox sled treads since they dont rivet or screw through the bottom of the tunnel. They are nice but very expensive, $250 with the widening kit
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It can be done you just need to measure and double check you arn't going to rivet into your cooler. You could also get the grips that mount just onto the outside lip of the running board. They only give grip if your foot reaches over to the edge though.
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