Lots of googles for this in connection with trucks, but whether this fits into the context of your text.......
Van den Heuvel, Bakel
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Lengte laadbed Laadhoogte bed Laadhoogte achter Breedte laadbed Laadvermogen Extra:, 16.23 m. uitschuifbaar tot maximale lengte 21.33 m. ...
www.heuvelbakel.nl/html/eurodieplader3as.htm -

Het laadbed van de dieplader ligt nu op de weg, langzaam aan komt de Junttan dichterbij. Dan, op het laadbed, de onderwagen draaien en de machine goed ...
www.trucks-cranes.nl/vanelk143.html -

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Note added at 7 mins (2008-01-26 17:41:20 GMT)
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This also seems to refer to the boot space of a car or estate car as having a cargo bed.

Mazda Cargo Liner
You surely use your Mazda vehicle for transporting people, pets, gear and other stuff. And as you carry out such activities, your cargo bed can’t escape from mud, melting snow, salt and other types of dirt and debris. Plus, you might be hauling things that might spill. Fortunately, Mazda cargo liners are there to serve as affordable insurance. Mazda cargo liners are designed to give you maximum cargo area protection. The truth is, without cargo liners, you won’t be able to use your Mazda the way you want them. It is because dirt and grime from your cargo could possibly damage or make your cargo bed unclean.

Mazda cargo liners put utility to your Mazda car and SUV. They guard the cargo bed or the carpet that’s mounted in it from possible damages brought by less-than-careful cargo loading. Some Mazda cargo liners are made up of materials and designs which keep spills, dirt and grease from flowing to the vehicle’s interior. There are also Mazda cargo liners that are really easy to clean so you don’t need to replace them as soon as they become dirty. It’s just a matter of removing it and hosing it off or brushing it.
http://www.partstrain.com/ShopByDepartment/Cargo_Liner/MAZDA

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Note added at 9 mins (2008-01-26 17:43:37 GMT)
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Clint.be - Prototype: Toyota A-BAT
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Door het passagierscompartiment zo ver mogelijk naar voren te schuiven, blijft desondanks een voldoende groot laadbed over. Dankzij de negentienduimvelgen ...
www.clintmagazine.com/index.php/Prototype-Toyota-A-BAT.html -