Thank you for sharing your impressive handiwork. Working in the limited space inside a TrailManor is quite difficult and you've done a great job of retrofitting your new tank and toilet.
Over-venting is certainly not a problem, but with our small plumbing system and limited vent pipe routing options doesn't appear required. I've now been using a combined cleanout/ vent line for over 6 months and the amount of pressure equalization of the holding tank has been fine. My cleanout has a flow-through spray head of the type normally used in brew tanks; so the design is different from the Camco Tornado unit which may be the difference allowing adequate pressure equalization via the rinse-out.
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