Porky69,
I guess I never thought about someone using airbag pressure to weight comparison, but now that you mention it, if you took the time to figure the math I guess there is no reason you would not be able to do it on a specific vehicle.
I was stuck in my thinking along the lines of multiple sized airbags available for different suspensions so there would be so many variables, but what you say makes perfect sense if you have your knowns up front it would be a very cheap addition to an air bag system to make an accurate "Scale" on your chassis with pressure gauges.
Might I inquire of you on your truck, did you have independent air bag controllers for side to side on height control or did you have one valve per axle or one valve for all four bags? (I am assuming you had tandem drive axles.)
If you had a divided system did you have to have more than one air gauge?
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