I plan for the front hatch to serve two purposes. When the trailer is being used for cargo, it'll provide access to cargo in the front of the trailer.
When the trailer is configured as a camper, there will be a pantry cupboard inside.
You may notice that the slide-out kitchen in the image above is taller than the tailgate. The fridge itself is the same height as the tailgate, but the slide/drawer for the kitchen makes the kitchen too tall to slide out through just the tailgate. So I added a hatch to allow for the height of the kitchen. So it won't get in the way of the cupboard hatch, it's on lift-off hinges (right). I've installed a locking paddle handle, but haven't put the latches in yet (center photo). I may also add supports to the hatch to hold it horizontally, that way it can also serve as a shelf when the kitchen is in use.
I hope to have everything finished and installed on the trailer just after the first of the year.
Both end panels are now glued together and they're just about ready to put the finish on. This kitchen access hatch wasn't an afterthought, it was always in the plan but since it would be so easy to add just before the finish goes on I waited until everything was fitted to the trailer, glued together and solid before I made the access hatch and opening.