While a certain peace of mind comes with the rig being somewhat overengineered, there's no evidence on this forum that I can find that indicates a strong reason to go with a larger axle. Certainly no axle failures have been reported. And, despite the math telling us that some extra load margin on those 14" tires might be a good idea, the tire failures reported on this site don't seem to suggest that 14" tires or 2720SLs (the heaviest of the 14" tire models and one of the most popular models overall) are any more prone to blowout than the 15" tires or the other models. Just an observation.
Of course, if you anticipate rougher than normal treatment and heavier than normal loads maybe it's a good idea.
-Paul
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