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| So I have to haul wheat Friday with my new to me semi, 01 IH 9900i and 40' Trailstar end dump with two axles plus a 3rd that's a lift. I have a weight gauge in the cab for the tractor that shows in pounds and two air gauges hooked into the air suspension on the back two axles plus a gauge on the air bags for the lift axle.
Any one have a rough idea how many PSI the gauges on the trailer should show to be legal, in Canada I'm legal for 55,000kg (121,000lbs). I have heard not to go over 60psi, is that just for that trailer (not mine) or is that a general rule of thumb? Trailer doesn't have a chart for axle weights vs suspension pressure.
I know I won't know much for my truck specifically untill I take in the first load on Friday but would like to have a bit of an idea before hand.
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 image.jpg (126KB - 936 downloads)
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Judging semi weights by suspension pressure
