what's the heaviest practical limit for 8 wheeled vehicles?
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Depends on the type of vehicle for instance CAT 797F mining trucks with only six wheels can have a Gross Machine Operating Weight (GMW) of 1375000 lb. http://australia.cat.com/cda/layout?m=41…
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It depends on the configuration of the wheels and size. For example the DOT limits to a eight wheel configuration on a commercial truck known as drives or tandems are limited to 34000 lbs or 17 ton gross weight limit. A 4 wheel config on a single axle dual wheel is allowed 20000 lbs or 10 tons gross wt.