Well, I use this as a cargo trailer throughout the year as well, so don't plan on windows. My buddy that lives in Douglas has a 7x14 that does have windows and he's installed a heater and cabinets. His however, is a dedicated hunting rig.....
I use a buddy heater to warm it up before bed, and then again in the morning. There's a vent in the roof for air and a side door as well as a dropgate rear door for loading ATV. Had I not gotten it at a great price, I would have bought the 7x14 tandem axle v-nose model.
"Lead, follow, or get the hell out of the way!"