I suppose truck manufacturers never stop to think that a short person, or REALLY fat person might want to climb into one of their trucks. Why else would Volvo only put two steps on their trucks, and THEM 19 inches or more apart? My old Mack was hard enough for me to get into, but my current one, a Volvo has, on several occasions, actually caused me to make more than one attempt in order to get behind the wheel. That's bad enough, but it was becoming obvious that I was going to blow out my left knee VERY shortly, unless something changed. So, it changed.
Drilling no extra holes, I used the existing 5/16 holes in the steps to run two all-threads of that size between the steps. Putting a piece of pressure-treated 2x4 at the halfway point gave me the added step that I needed. The distance from the ground to the first step wasn't inconsequential, so I wanted to add something there, too. I hesitated to mount anything solid, though, as it might catch on something and rip the whole step assembly off.
Seeing a length of 5/16 chain some former truck-driver had carried in the truck (probably for "protection"), the idea occurred to me of a hanging step. Mounting a couple eye-bolts on the bottom of the lower step gave me a place to hang each end. Since certain places might still have objects that could snag a chain, I put a carabiner on each end, so the chain could be removed quickly, if desired. Using a bolt-cutter, I cut the excess length off the two previously mentioned bolts, and the eye-bolts, and called the job done. The system is still a tad awkward, but it's a whole lot better than what was there before.
As you can see in the photo, a couple trips to the limestone mine has already coated the carabiners with limestone slurry from the access road, so I'd best keep them cleaned and oiled a bit, to insure their easy removal. © 2015