In my opinion, an elbow like that would cause problems with material movement. At a minimum you would need to use a whole lot more water when flushing which will make camping without water & sewer hookups less enjoyable. If you must have such an arrangement, I would #1 consider a composting toilet, or #2 look into a macerating toilet which will break down the solids and make it easier to move them to where you want them to be.
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Bob Martel
WBCCI# 5766
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