After long thought and lots of head-scratching I think I figured out a decent way to hold a lantern on a shelf in the wagon.
I found some old steel brackets and installed the shelf over the stove. This fits the newer “Blizzard” lanterns with the large tanks so I think all of my lanterns will fit.
I put a brass insert in the shelf and carved a small knob to fit. Please excuse the messy workbench. Of course, the rest of the vardo build is here: Vardo Page.