The front door only starts to make sense when you are working with small packages such as shown on the photo in your post
Also fine for roll on-roll off loading. Back in IPEC days (1 x -101, 2 x -222) we constructed some long flatbed trucks which carried a full complement of pallets - use two trucks, one at either end. As the fresh pallets are loaded on, the old pallets are pushed off. Made for quick turnarounds.
AWA ARGOSY (chota.me.uk) see seventh photo down from the top.