I researched a long time trying to decide if a composting toilet was going to work for us. It just would not, and here is why.
I don't want my poop rotting away in my bus.
A single container composter will never work right. You need one with removable pails. No point in me trying to compost if I have to remove it from the bus. I may as well toss it into the garbage.
Cost. Everyone of them was at least $1500.
Size, most of them were too big to fit in a bus.
This leads us all back to the 5 gallon pail. It cost $5, you can get them anywhere. Using a bag as a liner, wood ashes from your stove, saw dust, kitty litter, ect to cover your waste each time is highly effective without smell. When the pail fills up, the liner get's pulled and added to the garbage disposal.
A nice plywood box to hold the pail and seat is what some of our fellow members have done. I also use this method, and It works well.
I don't leave mine in the pail. I use small grocery bags, coal ashes, and pull the bag after every use. Then I incinerate the bag in my coal stove. I like this better than tossing in the trash, as no matter what temp it is outside, there is no smell.
Tossing human waste into the trash is not breaking the law in most places. This is where all baby and adult diapers get disposed of.
So build a box, buy a pail, a seat, and save over $1000.
"Don't argue with stupid people. They will just drag you down to their level, and beat you up with experience."
Patently waiting for the apocalypses to level the playing field in this physiological game of life commonly known as Civilization