I've currently got a fancified bucket. It takes a bin liner then after you've used it, sprinkle cat lit on top and close the lid.
What I'd like to do is work out some way of using a removable black tank that I can move easily fir emptying with a bonus of being able to connect via a stinky slinky to a sewer system.
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A Dometic High Profile 300 RV Toilet is under $90 at AdventureRV.net ( when this style is mounted directly over the waste tank, it takes very little water to flush).
While you are there browsing around, look for a " portable waste tank " to see if anything suits your desires.
Big rig custom sleepers, like ARI and ICT use a "cassette" toilet. It has about a 3 gallon tank that removes through a small door in the side of the truck, then you can take that tank inside and dump it into a toilet. Good Luck, TomC