Here's my 4x4 conversion van.
The side awning is
mandatory, you can attach a screen room to the awning to keep the bugs out but still sleep with the side door open.
Inside, the bench seat folds down into a twin bed. There's toilet in the back, not that I care, but chicks dig the fact that they don't have too go far in the middle of the night. TV, VCR, microwave, electric stove, refrigerator, toilet, sink, roof-top air conditioner/heater.
I've made a bug screen the attaches with Velcro to the inside of the side door. It has a zippered flap, just like a tent. Keeps out the mosquitos. I also made a thick curtain that attaches with Velcro to the inside of the windshield for privacy.
The ceiling fan is also extremely useful to keep the van from getting too hot at night. Here in West Virginia it's 90 degrees and 90% humidity in the summer.
Eleven miles to the gallon, I only take it out for local weekend camping (New River Gorge).