water vacs
Actually I was planning on bringing the Ritello, Quantum, Hyla and Roboclean, I think Tom already has a Vivenso. A central vacuum theme at some point could be interesting, if you have several power units like I do, bringing a few of those could be interesting. I use all of my central vac units free standing, no pipes, just connect the hose to the in-take and you have a very powerful, super duper canister cleaner, and I am a canister only person, for those who love uprights, that's fine, it's personal preference but an upright will never match the flexibility and versatility of a canister cleaner.
Mike