You have the option of a tongue box or spare carrier. It is in the desgin to counter weight the water and the equipment in the rear of the trailer. I am also looking at making a swing out kitchen with sliding shelving. Spoke with a canvas guy Friday that says he can enclose the kitchen area for a reasonable price.
I am changing the AC to an option, and installing the Fantastic Fan 6600 as the standard feature. Very few would use the AC normally and the fan has very special features, thermostat, closes on rain or when the fan is off. It actually opens when it is too warm in the trailer and has a remote control. I feel that will give the average user all they need. The trailer is quite warm and do not feel it needs a heat strip, that was the real reason for the AC as it had a heat strip.
Regarding the pop up top, it does create a problem in that the area of the bed is normally in the rear, which means it is only a few inches more head room as the base becomes the bed, the higher area is towards the front and that would have you standing in the center of the bed. I will look at reversing it, but I really do not want to have a cooking area inside over the lower mattress. As to just adding an extra area for sleeping it could be done I think. Have thought about it and looked at a friends VW. I still need to talk to the fiberglass guy about it. Building molds for the roof and designing the lift is a lot of money.
I am trying to keep my trailers fully loaded, comparable to the base priced trailers of my competitors.. I believe mine have far more options than the others and adding another will take the profit margin out. We all have to make money doing this.