WE have been using our Nature's head now for a year. It does the job with no hassles or smell. We emptied out Natures Head twice when we were far away from civilization and just dug a hole, and buried the waste. The pee pot gets emptied every second day, into a roadside dump point or public toilet where possible or otherwise out in the bush. We use a water spray bottle on to wash down after a pee, helps keep things clean. We only empty the solids pot when it get really difficult to turn the handle. We use baby wipes instead of toilet paper, and put them into a bag along with all the paper rubbish. We burn that in the campfire at night, or it goes in a roadside rubbish bin.
Finding a place to empty the solids would if we were driving around cities and towns would be quite a bit different than driving in remote areas, but there will always be an RV dump point somewhere in a town.
The toilet fits inside a cabinet, on a slide out. It is a very tight fit vertically, so no need to bolt it down. We have heavy duty velcro like patches on the bottom, and the base holds it in tight as well. We have had no problems with spillage or movement , despite driving on some very rough roads.