No more than 2 inches
DOT minimums are 2/32ds for trailer tires and drive tires, and 4/32nds for steer tires. New from the factory, it varies between tires. Drive tires may come new at up to 28/32nds, while steer tires tend to be closer to 19/32nds new.
3.2mm on steering and 1.6 on drive
No you cannot plug or patch steer tires on a class a commercial vehicle
One can find more information about skid steer tires from the National 1 Tracks website. The website has information on solid versus pneumatic skid steer tires.
Front wheel drive. The weight of the engine puts pressure on the front tires giving you more traction to the tires that not only propel the vehicle but also steer the vehicle.
Tractors have small tires on the front to make it easier to steer the tractor. Large tires are harder to steer. The large tires in the back allow the tractor to have more power as it plows.
Skid steer tires can be found in many places, but like everything else 'cheap' is a matter of opinion. Skid steer tires are available at specialty stores, as well as amazon.com. Perhaps the cheapest would be available on ebay.com.
Steer in the direction of the skid. The idea is by reducing the friction the front tires have the sliding rear tires will come back into line.
There are numerous tire brands that make skid steer tires. Just to name are few there are Titan, Goodyear, Bridgestone and many other tires companies.
Are you referring to what is called over-steer and under-steer, which vary whether driving a front wheel drive or rear wheel?
Depends on the type of trailer you are pulling but for the most yes 8 wheels on the trailer 8 drive tires on the rear of the truck 2 steer tires there you have your 18 wheeler If you re using Super singles ( the single wide tires), then just 4 tires.
4/32