4 foot wide by 8 foot long by 13 12 tall, all aluminum and welded, no corrosion, bolts to truck overhead rails easy. Lots of storage space overhead, or would work great for lightweight trailer, all aluminum for lightweight, but extremely sturdy. 250.00 cash in hand, might consider trade for whatever of value. Call or text, no delivery, no brokers, no nonsense. Thanks for your consideration.