What's An Accelerometer?An Accelerometer Is A Device That Is Used To Measure G-forces. Braking, acceleration, and handling can all be broken down into how many Gs the vehicle can produce. For a street vehicle, anywhere between .4 and .7G is a normal First gear acceleration reading, while 4WD trucks or cars with sticky tires can produce .7 to 1.0G upon a hard launch. Often, traction, and not horsepower is a limiting factor, and since our dualie could spin all four rear tires in first gear upon accelerating, we were able to use a G-tech accelerometer to measure traction. As a side note, many electronic accelerometers can be used to time 0-60mph runs, quarter-mile times, and more. More often than not, they are very accurate as long as the road surface is completely flat and the machine is zeroed out at a perfect .00G before acceleration tests begin.
For size, we chose the 235/85r16 Dura Grapplers, a step up from our previous tires, which measured 215/85r16. | 
We had high-pressure valve stems installed for extra durability. The one flat we did get with the old tires was due to a leaking valve stem. | 
A good balancing job is key to long tire life. An alignment is also critical while you're in the shop (remember our old tires!). |
Here is a good example of the tread depth that the nitto Dura Grapplers have. When doing our penny test, not only is the top of Lincoln's head not showing, the whole coin almost disappears. | 
The Dura Grapplers have an all-season, all-terrain tread pattern for traction both on- and off-road. | 
We were worried that a 235-width tire might not fit in the back because of the dual rear wheels. It turns out that there was plenty of room. |
Our new tires filled out the fender much more than the old ones, looked better because of their aggressive tread, and gave the truck almost an inch more ground clearance. | | |