CURT A16 5th Wheel Hitch with Base Rails, 16,000 lbs Model 16121CURT A16 5th Wheel Hitch with Base Rails, 16,000 lbs Model 16121 The CURT A16 is designed to provide a surprisingly quiet ride while maintain superior towing power. It has a gross trailer weight capacity of 16,000 lbs. and can handle a vertical load up to 4,000 lbs. It comes with a three position coupling indicator visible from your pickup truck cab, an extra wide head for easier coupling and high strength interlocking die cast jaws for a secure hold