Why?
First off I agree with previous responders to you question. More information is needed to answer your question.
The question that came to my mind is why do you feel the need to have a “boost” of power to drive up hills? Our solution to hills and mountains is go slow, take our time and not be in any hurry. That is, after all, one of the big benefits we have in RVing - slow down and enjoy life.
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