I haven't searched for that feature, but here's something else to ponder...
Supposedly the Allison has a built-in slot for a 6th gear. Some of the more pricey RVs have 6 gear Allisons, I'm not sure of they're Allison 1000s or 2000s. The aftermarket folks haven't jumped on it yet, so it must be more difficult than orginally thought.
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