Find out what your truck payload limit is by looking at the driver door post sticker. The payload max for your truck should be there. You will need to weigh your rig loaded for travel to know your actual trailer pin weight. Guessing or using percentages might be right, but it's still a guess. Go to the scales. Your payload is the pin weight, plus passengers, plus all other cargo in truck (tools, hitch weight, cargo boxes, fuel) if this total payload is less than your truck payload sticker, you're good to go.