By far the best one I've ever seen was over on the Expo Portal thread:
Rin started a Canopy Camper thread that’s pretty active, there is a fair amount of crossover with the Khaya, but it is distinct enough for its own thread. Share your experiences, ask questions. They aren’t widely dispersed in the US and I can’t be the only one in the US with a Khaya on a Ranger.
forum.expeditionportal.com
Post number 6 by Boltripper. He made it himself but it seems to be the perfect solution for what you're talking about. His is/was on the back of his Khaya which I think he's sold now. Maybe contact him for details?
My first though would be to put L-Track on your Molle panel, horizontally. That would allow you to use eye bolts and carbiner to mount pretty much any back that was the right size back there.
I was going to mention how silly an idea storing trash on the outside of your camper was (I honestly never understood it) but you covered that pretty well, and the firewood thing makes a lot more sense. I'll also say it's sad, but I've given up on fires, since about 2018 I haven't had a proper campfire, wow that is sad, but carrying a fire pit and propane has not only been infinitely easier and more space efficient compared to wood, my wife has grown to greatly prefer it because her hair doesn't smell like smoke for a week... I digress.
I recently found this:
Hanging camp trash bag holder for any vehicle. Easily hang from seat back, table, molle panel, and more. Retention rings holds liner bag in place and full-length zipper makes for frustration-free removal WHEN you overstuff it. Available in two sizes.
radiusoutfitters.com
That along with this:
NOTE: You can order a Trash Tube + Lid together by clicking on the links below and selecting the "WITH LID" option from the drop-down: Large Trash Tube Small Trash Tube If you already own a Trash Tube and just need the lid, then this is the correct page to order the LID ONLY from. What's...
radiusoutfitters.com
I think would make the perfect inside trash container, at least in my camper that has a L-Track mount on the "kitchen" wall off to the side.
I'll look some more into smaller trash containers, this Blue Ridge one always looked good.
The Tire Storage Bag using that unused space on you tire. to store all that stuff you don't want in side the truck.
www.blueridgeoverlandgear.com
Check them out it seems like with a full Molle back it would mount easily to your campers panel.
Final option might be to forget about hanging something big and heavy off the back of your camper that can be easily stolen and just get a heavy duty tote bag and fill it with wood and put it in your camper or truck back seat. Might be easier and probably carry a heck of a lot more.
A good bag is a key for living in a small area like a van. Without the ability to properly "unpack" your clothes as you would at home, an open-top bag like the Large Gear Tote is perfect. An open-top bag allows you to store your clothes and other gear while accessing it more easily than a...
owlvans.com
Ok, now I've got to check out stair carriers...