If memory serves there was the minor issue of the tires being rated for less then 100 mph. a 4000 (well closer to 5000 but who is counting) pound truck isn't going to handle very well with 3 tires. I have done several weeks of skid pad & high speed training in NC.. Trust me when I say this: The sudden loss of a tire at high speed causes the car / truck to pull to that side. The faster you are driving, the harder the pull. The Xterra is high center of gravity. The frame alone is higher the the center of gravity on sports cars. The tranny & moter are mounted ABOVE the frame, making things worse. Forget the truck body that goes higher still. My hood is higher then the roof of a Honda S2000, and that is designed to go fast! If you want to go fast, get somthing lower to the ground. You WILL ROLL your truck. With 3 tires left, at high speed you will not be able to correct before it is to late. The rolling resistance of the bare rim, digging into the pavement at 100mph is far higher then the tire on the other side. If it is a front tire that fails, if you TOUCH the breaks, the other front will start to slow the truck, the bare rum will do squat. Yor will go from pulling to one side, to pulling to the other. As soon as you release the breaks, it will pull back to the side with the flat. Unless you know what is going to happen, and have practised it over & over, you are screwed. What are you going to do if the tire fails, as you are changing lanes or somthing? At 100mph there won't be any glass left, Whatever isn't tied down will be who knows where. The roof & sides arn't designed to stop a 100mph impact with a guard rail, tree, freeway support, someone elses car, the median.. whatever.
The truck will disintergrate around you. There may not be enough left to protect you by the time it comes to a stop, unless it hits the back of a semi or somthing, then you will be dead from the impact.
The reason everyone is jumping your shit is no one wants (more) bad press on suv's. Last thing I want is my insurance company to tell me is they are jacking my rates 1k a year because someone killef themselves and took out a family in a minivan.
Low center of gravity cars tend to skid & slide till they hit somthing.. guard rail, edge of the road & dirt sholder.. whatever.. High center of gravity trucks tend to flip (look at the exploders a few years ago) because teh driver does somthing they shouldn't have, and lacking the training don't know how to fix it before it is to late. Not all (or even most @ that speed) are recoverable. On the skid pad I lost it far more often then I saved it. But that was the idea, to get rid of the cockeyness, and teach us that this can KILL US!!

P.S. if you are responding to someone,
quote a little from them so people can keep up.

I you are intent on going faster, Try these people.