1 Your liver makes and stores fuel. 2  Your liver makes glucose from carbohydrates (say car-bow-hi-drates) that you eat, such as ones in bread, fruit and dairy products. 3  Some of this glucose travels in the blood to the rest of the body where it is used for energy. For example the liver makes urea (say you-rear) from parts of proteins that can't be used. 2  It is poisonous so the body has to remove it. 3  Blood collects this urea from the liver and sends it to the kidneys. 4  They filter urea from the blood and it is then expelled from the body as waste in your urine.
Using any of these trailers Flatbed, Step-deck or RGN, the actual height of the load including the trailer height can not exceed 13' 6, the width can not exceed 8' 6 and the total gross weight including tractor (truck), trailer and cargo can not exceed 80,000 lbs. to be considered a legal load.
The semi-truck without the trailer weighs around 20,000 lbs. An empty trailer weighs around 12,000 lbs, but it depends on what type of trailer it is. There are hundreds of different configurations. The point is...the maximum legal weight that an 18-wheeler can weigh is 40 tons (80,000 lbs). If they weighed any more, then they would damage the roads more rapidly than they are even now. But a semi-truck can exceed that limit for certain situations.