Receiver hitches are divided into five classes based on their towing capacity and receiver tube size. Choose a class that matches or exceeds your trailer's —the weight of the trailer plus all cargo. Hitch Class Max Towing Capacity (GTW) Receiver Size
Subtract your vehicle's curb weight (its weight with fluids but no passengers/cargo) from the GCWR .
For safety, many experts recommend staying within 80% to 90% of your max capacity to account for hills, wind, and emergencies. 2. Understand Hitch Classes