Yeah, most hotels I've been in used electronic locks with no moving parts you can hook that to. Just a card reader on the hallway and a door knob inside. Door k

Yeah, most hotels I've been in used electronic locks with no moving parts you can hook that to. Just a card reader on the hallway and a door knob inside. Door knob works as the additional lock (upward position in a European style knob) most often. I would still use a door stop - a rubber one doesn't weight much. But I would just carry one - with my luck the other door would be a slide door or open outside.