Unusual trailer axle combination
#1
06-25-2009, 03:28 AM
Unusual trailer axle combination
The recent discussion about speccing a flatbed got me thinking about an axle configuration that I don't see too often anymore. Back in the 70's-80's I used to see Canadian trailers with a regular spread tandem and a lift axe towards the middle of the trailer (Maybe about 10+ ft from the tandem.)
Does anyone know why these fell out of favour? What's the advantage to this set-up? Examples: http://www.hankstruckpictures.com/pi...8/file0098.jpg http://www.hankstruckpictures.com/pi...rabel_v_03.jpg http://www.hankstruckpictures.com/pi...ansport_ws.jpg 
#2
06-25-2009, 03:39 AM
I've never pulled one, and never had a chance to take a good close look at them either. But, it seems to me that the rear tandems were fixed, and the bogeys were able to carry a measure of the weight from the rear axles and make the load legal. At the time, I don't believe they recognized a ten-foot spread and allowed 20K for that axle.
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#3
06-26-2009, 10:33 PM
In Ontario you only need 9 ft to get 22,000 lbs on a axle. A common spec was a 6' spread on the tandem and a lift 9 or 10 feet ahead. They are getting phased out because Ontario is slowly getting rid of lift axles in favour of steer axles.
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