I looked at the new lineup and found the difference in Berkshire and Berkshire XL to be the length of the coach.
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There is more then just the length. The Berkshire line is 340hp, Allison 2500MH, vinyl floors, smaller tires and less weight carrying capacity; being some of the main differences. The Berkshire XL is 360hp, Allison 3000MH, bigger tires, more carrying capacity and porcelain floors. There is probably a lot more differences which I'm sure our great forum will bring to light.
2012 Berkshire 390BH
Gale & Hank- 2012 Berkshire 390BH