Standard equipped factory transmission coolers, not rated for towing, are not large enough for towing any trailer over 3,000 lbs. Selecting a Trailer Hitch A weight distribution hitch is needed for any of the larger trailers. This type of hitch allows the tow vehicle and trailer to be level. Hitches have two ratings, one gives the capacity of the weight the hitch can hold or hitch capacity. The other gives the amount of weight that the hitch can tow or towing capacity.
Any trailer can sway.
Look for a hitch that controls or prevents sway. Fifth-wheel hitches and hitches that emulate them prevent sway and give superior towing control. Fifth-wheel hitches must be bolted through the truck bed and to the truck frame. Make absolutely certain of this. Remember, a hitch or what we also refer to as a towing system is a valuable piece of machinery and requires periodic safety inspections and maintenance.