I think OP needs to find out actual numbers on his Tundra. GVWR, payload, GAVWR, etc. Payload is first place to go over.
What I found was, max payload is 1640, but, that is for a 2WD regular cab. Crewmax with 4X4 is heavier and reduces payload accordingly. Dealer, or, customer added options, also reduce payload. A bed cap can take 150 - 200 lbs. It's surprizing how fast they add up.
Once actual payload is known, sutract 100 lbs for WD hitch and sway bars. Then subtract driver and passenger weight. What is left is available payload for tongue weight and cargo.
Disregard UVW or shipping weight and advertised tongue weight on the trailer. They don't include propane, batteries, or dealer installed options. Those numbers are going to be higher when loaded for camping. Nobody tows empty.
On average, loaded for camping weight is 1000 - 1200 lbs over shipping weight.
Average tongue weight is about 12% of loaded weight. Less than 10% is not good, more than 15% is also not good.
Though not a written rule, the 80%/20% helps to keep close on the payload.
Example:
9K towing capacity X 80% = 7200 lb loaded trailer
7200 lb trailer X 12% = 864 lbs tongue weight
If actual payload is 1400 lbs, minus 100 lb WDH, minus 450 lbs driver, passengers, and cargo, available payload is 850 lbs. Hang 864 lbs tongue weight, and your over by 14 lbs. Notice there's no firewood in these numbers.
Deal breaker, I would say "No", but, the unwritten rule did help to stay close.
