Re: Ever put your car in a moving truck?
I did it 30 years ago. I put a BMW that I was restoring in a 24' U-Haul, because I had to tow a trailer behind the truck. I loaded the car into the truck at a railroad siding and unloaded it with home made ramps.
If you make your own ramps, you must build supports to prevent flexing of the boards in the middle. If you don't, they will skip out from under the vehicle and you will put a few big, ugly dents in it! BTW, no I didn't make this mistake but I once saw the after-effects of someone else doing it.
I agree with the thought that paperwork should be kept easily accessible, but I wouldn't worry too much about weigh stations. If you are moving "non-commercial" goods, you don't have to stop at them. Agricultural stations are another issue entirely and you do have to stop at them. These are the folks who are likely to want you to open the truck for inspection.
I would have to do a little research to offer an opinion on the gasoline issue. My Beemer didn't have any gas in the tank (no fumes either), so that wasn't an issue for me.
Even though I successfully did this, its not something that I recommend. Frankly, getting the vehicle in and out is a pain and its not the safest idea in the world. The biggest problem that I have with it, is the lack of suitable attachment points for straps or chains. Box trucks do have a rail system in them for cargo restraint, but they are not made for dealing with so much weight in a concentrated form.
Obviously, the largest danger is having the vehicle slam forward in the box, should an accident with sudden stoppage occur. The most natural inclination is to load the SUV in the forward part of the box, up against the front wall, but that is a bad idea in terms of weight distribution. Once again, you have a great deal of concentrated weight and it will not be balanced by much lighter furniture in the back. The end result is that you will have too much weight on the front axle. If you do go through a weigh station for some reason, they will notice the imbalance immediately, because their scales measure weight on each axle or set of axles.
Placing the SUV in the front of the box is also not a true safeguard against a violent shift forward. I have actually seen frieght go through the front wall of a box truck as a result of an accident. The specific accident that I am refering to, involved a tractor trailer driver who fell asleep at the wheel and ran off of the highway, into some trees. The truck was slammed to a stop by several trees and the freight blew out the front of the trailer. It went through the "headache rack" on the tractor too, killing both the driver and a relief driver, who was in the sleeper.
Do yourself a favor, take the "plane ticket suggestions" and move the SUV separately. Its expensive and more complicated, but its a much safer arrangement. You might also look into having the vehicle shipped. That is not an inexpensive option, but it might not be as bad as you might think. Depending on when you do this, another idea is to find a college kid who needs to get back to school in whatever area you are moving to. This option should include a bit of background and driving record checking, but its workable. A call to your insurance agent to make sure that he/she would be covered, would also be prudent.