Your Tundra can't be more than 8100 Lb all up including you and anything else loaded in and on it including hitch weight. Nor can you go over individual axle ratings. Load it op with passengers and anything else you plan on hawing in it take to scales and weigh it. Know you know what you have left for pin weight, allow yourself a little leeway and remember this is not dry pin but total including weight destribeting and sway bars. I hope this helps it is not a 100 Procent accurate as som weight gets transferred to front axle of tow wehicles and som to trailer axles so better to be a little light than to heavy
