I'll post this again, cause it really says all that needs to be said.
Cannot do this in a small van. Full shelving on both sides. Still had two tool bags, a Festool case, vacuum, 6' ladder and 4' ladder in there. Also had a dumping trailer to go along with the tractor. I've fit as much as ten TV's in the van. Only thing I had to remove was some wire boxes that sit in the floor. Everything else I carry in the van remained in the van.
Mileage. It sucks. I have the 3.5l V6 and get between 11-13 mpg. You can get better mileage from other full sized vans. The NV has been reliable though. Oil changes and brakes are the only things I have had to do. While I'd love better mileage, I would not trade down to a small van that I have to plan every single job down to the fitting on what I will need. When unforeseen issues pop up, 9.9 out of 10 times, I have e what I need right there in the van.