lwmcguir,
Excellent!
I see on my schematics that my Venetian has the vacuum system set up the same way as yours. Also, the Dryer and block heater circuits are powered that way. The vacuum seems like the best opportunity in that there is a receptacle already there and very accessible.
I like your idea regarding Aqua-Hot basement temperature monitoring. I assume you are using a transmitting device to notify you? If so, do you recommend one? Also, are you relaying the signal via a coach WiFi system or a router, or some other means?
Thanks,
DaveB1