I've got the same trailer and plan on leaving ramp attached when I make similar camper. I'll use it as a mini patio with pipe flanges on it too screw short pipes for "patio" supports. Seen that on tailgate of a toy box hauler parked next to sidewalk on Rose Parade route years ago.
Unfortunately those house windows will not last. Vibration from roads and trails will separate the seals and let air in. Eliminating the reason for dual pane (no insulation)
This trailer seems massively overloaded with all this on it. I would guess it's rated for 1500-2000lb. By the time you get all this on one and full it with what you need how much do you think it all weights?