David, what you need is Jopa's "Urination Station" - do a search in our search bar, I think it will come up first.
Urination Station doesn't do much good for Number 2! I figure I'll end up with something like this, where I can just line it and chunk the bags:
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Not looking for TMI, but wondering if anyone uses the Thetford porta potty in their rig...
Thetford toilet