Thanks for the insight, helpful to know that TCs are exempt from any kind of codes, and that this isn’t that unusual. It looks like I’ll just be adding a 30 grey tank and replumbing the grey fixtures into it.
The blue tote is a great idea, and I will additionally bring one or two in the trailer with me for extra capacity when needed (We’re not the most conservative with water, coming from a toy hauler with a large capacity). But I must add a grey tank for the convenience, and as I tow various trailers behind the tc, would be inconvenient to have to wheel it out of the trailers whenever I needed to use a fixture when on the road, but they are excellent for boondocking.