If you do not want to deal with plumbing and a blackwater holding tank, you should consider a Nature's Head Composting Toilet. You don't have to be concerned that it is mounted directly over your blackwater tanks, giving you more freedom to locate it wherever you want. These are advantages, especially for vans and small buses.
Nature's Head is one of the top-selling composting Toilets on the market. It is easy to install and should last several years with little or no maintenance.
https://natureshead.net/
