CDL – Commercial Drivers Licence

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  Separate tanks inside the trailer

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  Interior bulkheads with holes that let the liquid flow through

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  A smooth interior, and is often used to transport food products

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  Dampers that float on the liquid to slow movement
  
  

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  Weight of the liquid

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  Legal weight limits

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  How much the liquid will expand during transit

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  All of the above
  
  

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  Trailer air supply control

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  Relay valve

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  Glad hands

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  Cut-out cocks