There should be a sticker on the pin box with it's ratings on it. Does your trailer have a factory rear receiver hitch with a plug for tail lights? If so, it will also have a sticker showing max tow weight. If that's the case then your hitch is already rated to tow that weight in addition to itself as long as you are within the posted GVWR weight.
Jeff & Sandi (and Teddy - 7lb Schnorkie)
2018 Montana HC 305RL / Andersen Ultimate Hitch on B&W Ball
2012 RAM 3500 Big Horn Crew Cab 4x4 SRW / AMP Power Running Boards / Air Bags