My cupboards are a little different because they are under the bed instead of over the bed but the space available is similar because it’s still a tiny trailer. So, here’s “MyAway” of packing:
I have a sheet set that came in a matching drawstring bag. You’ll see below that the bag now holds my socks and undies! Also in the picture, my shower shoes are held out of the way by a cargo net that is attached to the side of the cupboard. And, you’ll see part of a set of stacking Rubbermaid tubs that I use(d).

I still use the big bottom tub for an extra set of jeans and sweatshirt but have found that a set of suitcase packing cubes with clear fronts work better. However, if I had it to do over, I’d get multi-color ones because I could grab what I want and know by the color of the bag, maybe blue for jeans; yellow for shirts, etc….:
https://www.amazon.com/Dot-Large-Packin ... 141&sr=8-5Remember when “Aunt Etna” gave you that Christmas present of cologne, soap, etc. in a zippered plastic box-like thing? You could use that to hold toiletries in the teardrop! However, I use one of these and love it:
https://www.llbean.com/llb/shop/73882?p ... 0bag&pos=2Don’t forget that you can always buy one of these and cut it to fit inside your cabinet to store your phone, glasses, wallet, etc while you sleep. (I use one in my potty cabinet to hold Lysol wipes, bear spray, insect repellant, bandages etc.) This type of clear plastic shoe holder can usually be cut without looking messy after you’ve done it and you can use Command hooks to hang it:
https://www.amazon.com/24-Pockets-Simpl ... 28&sr=8-53One more thing I thought of: that rain jacket that you only need when it rains but you want it ready to slip on. You can hang it on a hook where you knock it off all the time or you can mount a cargo net above the door and put it in there, out of the way but handy when you need it!