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As the front tires gets wider there are steering geometry problems so I don't think anybody can just go to a wider wheel and mount them.
The answer to the weight on the front axle is simple in concept. Cluster the greatest amount of the coach weight as close to and aft of the rear axles as possbile. It makes no sense to put batteries, the generator or holding tanks any more forward than the bay directly ahead of the drive axle. As soon as that is done the front axle weight approaches the limits. Add in the stuff we normally carry and we are at or beyond the limits.
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My 2003 Liberty came with 365's on the front. As I understand it, this was an option as some modification needed to be done.
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Jon,You are right about the effort Liberty has made to insure that their coaches are not overweight on any axle.I was floored when I weighed my 05 with OTR and 2 slides and all my stuff and it was almost 3000 pounds under gross and none of the axles were close to their weight limit,I am still impressed with their engineering.