The only restriction is the weight - you can't legally gross more than 80,000 lbs. in a tractor-trailer in the United States (without having special permits). An average tractor-trailer unit (sleeper tractor, 53' dry van trailer) weighs about 34,000 lbs, so it can haul about 46,000 lbs.
Bottled beer weighs more than canned beer (glass is heavier than aluminum), and bottled beer has heavier packaging than canned beer.
What does this mean? On average, a 53' trailer can legally carry about 850-900 cases (24 -12oz bottles/case) of bottled beer, and about 1700-1800 cases (24 12oz cans/case) of canned beer.
Enough beer to make you more than welcome at any party you should decide to crash! :D
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