Supposedly the longer the wheel base, the smoother the ride. The only possible evidence I have for this is when I was driving private coaches (buses), we had an axle break on the bogey wheels (which were behind the drive wheels). We limped to a truck stop to have the bogeys removed and chain up the axles. The result ended up in a ride so bouncy that the drummer got car sick. I didn't know that the bogeys ever did more than hold weight, but apparently they are key to stabilizing the bus. They old GM buffalo didn't have bogeys and they didn't bounce like that, but the drive tires were further back.
Not quoting facts, just personal experience.
Doc Weaver
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Doc Weaver '98 Freightliner FL60 pseudo toy hauler
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