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double-stack vs piggyback
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[quote user="futuremodal"] <P>[quote user="MP173"] </P> <P>Dave...I never heard there is a difference between container heights and trailer heights. Not saying that I disagree with you, I have never heard it and I have been around trailers for years. Something to check into.<BR><BR>[/quote]</P> <P>The standard height of a trailer is 13'6" from ground to top. Some of the newer high capacity trailers use smaller diameter wheels tridems that allow the box's platform level to be lower, thus more cubic capacity (the box itself can be 10'6" in height if I remember correctly), while keeping to the 13'6" road height standard. I think they utilize air suspension to allow the platform height to match dock height.</P> <P>[/quote]</P> <P>Toured the local Swift base this morning. Indeed there were sizes of dry vans that are obviously larger height-wise than the one domestic container + chassis sitting down there, so it stands that dry vans today have more capacity than domestic containers. Those ultra high dry vans do indeed have smaller wheelsets (not necessarily tridems, some were regular tandems), but since the tractor units have the same kingpin height the front end of those vans must exceed the 13'6" road standard. I guess it pays for those outfits to have a list of low clearances (such as those pesky railroad overpasses from the 1930's![;)]) to avoid.</P>
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