Four wheel drive vehicles require strong durable wheels. Custom wheels for 4x4 trucks are made to take a beating from rocks and other obstacles found in the back country. One of the most popular materials for these wheels is steel because of its strength and low price.
Custom wheels for 4x4 trucks are designed for the most durability from the inside of the wheel to the finish coat. A steel wheel can rust if it is not sealed correctly. Dirt and mud can quickly corrode the sealing layer so regular cleaning is a must to get the longest use from a truck wheel. Using a mild solution of soap and water regularly can keep those wheels looking nice and performing at their peak for years.
On the high end of custom wheels for 4x4 trucks magnesium alloys are used and they are often forged as opposed to cast wheels. A forged wheel is made with extreme heat and pressure which makes the wheel incredibly dense and consistent throughout. The density also prevents corrosion. Although magnesium wheels are much stronger than steel they are also much more expensive.