First off, if you don't want to go to the trouble to put everything but your boat in the room with you, you shouldn't be parking at a Motel/Hotel. The thieves roam through their parking lots all night long with reckless abandon looking for an easy mark with little fear of apprehension. I use one of those large fold down dollies which makes it fast and easy to load valuables and put inside.the room including seats...
Next best thing I have found is to leave my wife in the boat all night. She will scare away anything that gets within 10 ft. How ugly is she you ask??? When we get to the lake everyone asks what bait I was using>>>>Okay, okay>>>just kidding...don't get upset ladies....she has actually never been in my boat....hates the water and fishing.
However, I have found that using one of the better Wi-Fi Baby Monitors with audio under the boat tarp that Detects Movement in and around the boat is a great way to get a good nights sleep. Mine saved me from losing trailer tires and wheels one night...
Like I said, remove everything and sleep with one eye open...

Take graph off, lock compartments and cover.