5 to 10 percent of the Gross Trailer Weight Rating (GTWR).
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10-12%
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Weight rating is what the power unit plus trailer is rated to
handle. The gross weight is the actual weight of the units plus its
cargo.
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Answer5-10% about 10%
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The length doesn't matter as much as the Gross Vehicle Weight
Rating of the trailer and the Gross Combined Weight Rating of the
combination of vehicle + trailer, as well as its use.