Science behind multi-axle load placement

Pressure guages on your air ride and some time at the cat scale or local elevator with a ground level platform scale. You can move your load around and see how things change and maybe figure out where you want the center of gravity to get the right distribution
if you are loading tracked equipment it’s center of gravity is approximately where it tips at the top of the ramp. If it’s something loaded with a crane it’s directly under the crane hook assuming the object is hanging level.

 

you can calculate the load c/g by using a formula to percentage of max load within friction tolerances.
You need to weigh the complete unit as it is ready to load and then you can fill in the formula.
max weight that can be carried on tractor and jeep (fw)
max weight that can be carried on trailer and booster (rw)
(fw) + (rw) = gross load weight
(rw) divided by gross load weight = % load weight (rw%)
now measure the distance from the trailer kingpin to the rear of the trailer (if a west coast measure to the trunion pivot(2) otherwise to the center axle of the trailer)
now take the (rw%) of the total distance and measure from the kingpin
that gives you the center of gravity for this unit.
(rw%) (fw%)

 

Just to let you know the same formulas can be used for any trailer or combination of trailers. as long as you work on kingpin and center of the trailer axles (or the trunion pivot)