This is no big deal, just something I bought at the "big" online auction site. There are several similar designs out there. They fold up when not in use, and when unfolded, there is a big metal loop that goes around the top of the tire, and a step that folds down to make engine compartment/bed access easier. I used mine while changing the oil, and it really did help, despite not fitting the wide mud tires very well. I really have to swap on those work tires and figure out the speedometer sender issues! Here are two images of such devices I "borrowed" from auction ads while researching this (neither one is what I ended up with): 
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