[Sixseven]

The difference in tow capability between enclosed and open trailers is more about the wind resistance and less about the weight. Although there comes a time when additional weight can be a factor. Even a V-nosed trailer poses significant wind resistance which will limit the towing capability of trucks with smaller engines. Wind resistance with the enclosed trailer is a significant factor which can explain why local hauling at speeds of less than 50 mph can be successful in a Ford 150 or equivalent.