I wonder if someone can explain the attached suspension geometry to me. It's on my motorhome which is essentially a 3 axle bus. The attached drawings show the rear suspension which has a single hanger that supports both the drive and tag axles. The drive axle has 4 air springs, the tag axle 2. The drive axle has a panhard rod (item #34) that connects from the frame rail to the differential housing. I know that this is where the roll center is located for the drive axle. What I'm not sure of is the significance of the line of attack of the tag axle control arms. A line drawn thru the tag axles bushings 53 and 38 intersect the panhard bushing at 34. What was the engineer achieving by this arrangement?
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