What ever brand you buy make sure it is a minimum of E rated. This rating works and wears good on my chevy 3500 towing frequently. Trailers are another story. Buy tires to give you at least 125% of the GVW of the trailer. This will eliminate those wunderful roadside stops to change a blowout.
Ralph & Snickers
2006 3500 Chevy Dually - 8.1 - Allison
2006 30' New Horizon - Solar