Ken,
Great question. I believe it to be true on a number of levels.
Manuverability - Those equipted with rear steering tags are far more manuverable at 45' than some single tags that are considerably shorter. This allows you to quickly get out of "harms way"
Engineering - Strip the coach of all it's interior & exterior "bling" and you'll find a coach that's over-engineered;
Larger 365 tires carry weight more safely while adding to ride comfort.
Larger Engines keep you out of the slow lane with climbing mountain ranges, regardless of what you are towing
Insulation ratings allow you this to be a "Four Season" coach with no chance of problems during a sudden freeze
Those are just a few of the things I can think of, off the top of my head.
Mark
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