Shineforu
This guide looks at Gravity Flush RV Toilet. Whether it suits you depends on your trip and setup, so the points below are taken from its Amazon listing and are meant to help you decide what to check.
Here's a quick look at what this one offers.
Amazon's page has the current price, full specs and reviews (ASIN B0FR4GRZGC).
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Check current Amazon listing (ASIN B0FR4GRZGC).
Fine print: The Dude has not personally tested this product. The details on this page come from the Amazon listing and can change; check the listing for the current specs, price and availability.