If temps will drop below freezing you might consider using some stuff of equal weight.
Overall, 80 pounds is a tiny amount. You can just mention that you are at dry weight and fudge an allowance on any adjustments.
Consider anything you pile in, tools, clothes, shoes, food, firewood, propane if empty, battery if not in, anything you normally carry that you don't keep in there permanently need to be account for.
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2017 SLX 195RB
2021 Jeep Grand Cherokee Summit L 5.7L V8
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