We just finished the last major job on our van conversion: a custom fiberglass shower pan that fits over the wheel arch. We have a Thetford Curve porta potty and want it to be securely mounted in the shower pan yet be easily removable in order to take a shower. The shower pan is too small to accomodate both the toilet and a person taking a shower at the same time. Yes, I know one can take a shower while seated on the toilet but that sounds less than ideal. We have the optional plastic Thetford quick-release screw-down base but it seems way too flimsy to secure a toilet that easily weighs over 75 pounds when both tanks are full or near-full in the event of a strong jolt or vehicle accident. This would not be a pleasant missile to be flying around inside the van. Also, for obvious reasons, we don't want to drill holes in our new shower pan. I am leaning toward contriving some sort of side-mounted T-track slide but am worried about water getting into the side walls or subfloor. I see all kinds of Youtube videos with toilets sitting in showers but they are suspiciously vague on how they are attached. I was wondering if anyone had any solutions to this? Thanks.