A heavy-duty truck with a top fifth-wheel towing capacity can haul 23,250 pounds, reports Auto Guide. The 2015 Ram 3500 won top honors by AutoGuide for towing just 450 pounds more than the runner-up, which was the 2015 GMC Sierra Denali 3500.
Despite those numbers, Auto Guide awards the GMC Sierra Denali higher ratings on handling loads overall. Test drivers reported that the Ram 3500 became difficult to shift and steer with loads of 4,000 pounds in the pickup bed. The 2015 Ford F-350 also performed well, towing 15,899 pounds. Although its towing capacity is lower than the other two trucks, the Ford F-350 is reportedly easy to handle under heavy loads.