Powerbuilt Tire Step for Truck, SUV, Semi, Heavy Duty 300 lb. Capacity, Non-Slip ‘Cheese Grater’ Steel Surface, Adjusts to Fit Any Diameter Tire Up to 13 in. Wide, Folds Flat for Storage – 647596EC

To access the box in the rear position, this step has been helpful for me. no problems with getting to things and it folds up small enough to throw in the back https://www.amazon.com/dp/B0002Q8TWI?ref_=ppx_hzsearch_conn_dt_b_fed_asin_title_2