On our most recent trip, we decided that using the top driver's side surface of the truck's rear bumper was too small a target, and way off center, especially when exiting for those midnight bathroom breaks. So for about $22 in materials, I bolted together two layers of redwood. The bottom layer fits the profile of the bumper "well", and keeps the step from moving to either side, and couple of bungees hold the step down. I'll probably paint it a flat black, and add some non-skid tape to complete the job.
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