What size trailer and what layout to sleep 4?

I have a 2015 Jeep Wrangler unlimited. 3500# max tow capacity.
I'm interested in converting a cargo trailer into basically a hard shell tent with sleeping arrangements for my wife and I and two small kids. I'd like a compact layout to keep the trailer as small as possible. Maybe a folding couch/bed for us and cot style bunk beds for the kids? Or folding bunks?
How important is insulating the trailer first? I've only ever camped in tents so I'm not sure if insulation is really needed.
Other ideas I'm kicking around:
-Place for a port-a-potty
-I have a small window a/c unit and it would be "cool" to incorporate that. It'll run off my Honda 2000EU and I can also wire the trailer for 110v to plug into a standard house outlet. Maybe build a cabinet with a small countertop, storage, and a/c unit in the bottom.
-Engel or ARB freezer/fridge for food storage
-Windows and a roof vent
-Screen for the rear so the cargo door could be dropped on nice days but keep the bugs out
-Eventually a propane fired water heater/tank/pump/outside shower.
I'm interested in converting a cargo trailer into basically a hard shell tent with sleeping arrangements for my wife and I and two small kids. I'd like a compact layout to keep the trailer as small as possible. Maybe a folding couch/bed for us and cot style bunk beds for the kids? Or folding bunks?
How important is insulating the trailer first? I've only ever camped in tents so I'm not sure if insulation is really needed.
Other ideas I'm kicking around:
-Place for a port-a-potty
-I have a small window a/c unit and it would be "cool" to incorporate that. It'll run off my Honda 2000EU and I can also wire the trailer for 110v to plug into a standard house outlet. Maybe build a cabinet with a small countertop, storage, and a/c unit in the bottom.
-Engel or ARB freezer/fridge for food storage
-Windows and a roof vent
-Screen for the rear so the cargo door could be dropped on nice days but keep the bugs out
-Eventually a propane fired water heater/tank/pump/outside shower.