I wanted a lockable storage box (trunk) for the back, but didn't want to spend $300+ on the BRP one. So I found this 20 gallon heavy duty box from home depot for $29. I bolted it through the aluminum rack frame. I used some left over Thermo-Tec to line the bottom. My cooler, tire kit, and tool bag, etc... fit perfectly. The total weight (including box) is about 30lbs.