I've always had one on my trucks. Current is a over cab high ARE. I have a compartmented platform in the back so I can store stuff under and when I rough it without the trailer I can sleep in the back. Racks on the top carry a 12' jon boat. I usually have a lot of fishing gear and boat gear in the back when pulling the trailer on vacation. Nice dry secure storage. I solved getting stuff from the front by a 6' long stick with a hook. I can get most stuff out without climbing in the back.