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Old 10-14-2012, 08:24 AM   #15
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1991 34' Excella
Princeton , New Jersey
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the procedure was to have the WD system lower the whole vehicle evenly, front and back (equal squat

I don't know the origin of this idea but it is completely wrong. Trucks are made to carry the load on the rear axle. There fore the SQUAT will not drop equally as you apply a load. The rear springs are designed to take the load while retaining close to original fender height. The front springs are designed to remain in as close to original height as possible in order to retain the steering geometry. If you were to drop the axles equally under load you would drastically change to front end alignment and wear the tires. This factor is less important with front leaf springs but very important with A frame front ends.

2004 Excursion 4x4
1991 34 ft. Excella +220,000 miles, new laminated flooring, new upholstery, new 3200 lbs axles

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Old 10-14-2012, 08:55 AM   #16
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2006 25' Safari
St. Augustine , Florida
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That's what I thought too. The RV handbook says to take your tongue weight (mine is 1000 lbs) and work toward a distribution of 300lb/300lb/400lb for that weight BUT consider the squat I would have on my front with 300 lbs added to it. That would go against Ford's recommendation of no added lowering for sure.

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Old 10-14-2012, 10:37 AM   #17
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The "old" WDH procedure had to do with cars (1960's forward) where the distribution of TW was 1/3 - 1/3 -1/3 on FA - RA - TA. Scaled weight values were the finishing touch then as today since fender height measurements are prone to repeatable error. Easily located three-pad certified weight scales make this much easier (and can be checked nationwide).

Nice job, OP


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