On my last two coaches (gas) I was able to install a central vac system under the bathroom sink. It is centralized and 120vac is readily available. I use one of the two (normally) shelves and therefore have plenty of space for storage. I also add a lighted switch on the side of the cabinet to turn all power off to the vacuum hose switch-connector as an extra precaution. I used the Dirt Devil system and just ensure the bag changing end is facing out.