How much does a empty 53 foot trailer weigh?

It depends if the trailer is made of steel, aluminum, fiberglass, or other materials.The wooden sides on the inside of the trailer would add weight.

The tare weight is listed on the outside.This may be called TW.Tare weight is the weight of the empty trailer or container.This may be different among manufacturers.

Look at some trailer manufacturers websites and see what you can find.I wouldn't hazard a guess without doing some research.If you have a rest stop or truck stop nearby, you could get one of the free trade publications and see if you can find anything.