This is just me thoughts but I would want one with a side door up near the front tongue area, maybe one window and of course the full drop down door in the rear for loading.
Google Image
Sooner or later you know you are going to use this trailer for a camping trip so the area in front of the side door across the front should be made something permanent like a work bench area or possible a kitchen area...
You can install the fold down beds on the inside walls or like some of them have is a drop down ceiling bed platform in the rear...
You can drop the rear door down and raise the end up level with the floor and make a great patio sitting area... Or a work area...
Dual axles will of course help big time with tongue weight problems...
Lots of views on-line what others do with their cargo trailers...
Roy Ken