Another more dangerous but lucrative hauling job is Hazmat hauling. Hazmat freight transport involves the transport of hazardous materials such as gases, flammable liquids or corrosive substances. This work requires special care for safe delivery, so the drivers are well compensated.
If this is what you want to do, you will need hazmat approval in addition to your CDL. This requires an application and a test, but many companies will pay to get certified as these drivers are certainly in demand.