Keep in mind there's more to it than weight. You have to consider the frontal surface you will be pulling through the wind too. The same half ton truck that wouldn't pull my trailer comfortably at 65 mph would pull my flat bed trailer with my rock crawling Jeep on it (Jeep has no windshield, top, etc.) no problem, even though it was almost 1000 lbs heavier.
2018 Rockwood 2304DS Ultra Light pulled by 2018 Ram 2500 Cummins Diesel 4x4