Smileycatcat,
There are at least a couple of porti-potti manufacturers and each have several models. You didn't include the max hight of the toilet you're looking for, but a quick search for Thetfords shows they have a 16 1/2" model and a 17 1/4" model. You should be able to either find one that is close "enough" or build a simple stand to raise the 12" model to whatever height you need.
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2001 Sportsmobile RB50 7.3
West Central Mountains, Idaho
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