I have no idea what movement trays even are.
If I wanted to do mass combat with D&D minis, does anyone have any movement tray recommendations that will work with the D&D minis?
What's the diameter of the bases for D&D minis? Are they different from the standard 25mm round bases? Also, how many minis do you want on a tray?
You can try here: https://litko.net/collections/specialty-movement-trays
I believed eve they are 1” for medium size, 0.5” for small, and 2” for large.
Yeah, since bases are traditionally measured in metric—trays for 25mm will work for medium, 50mm will work for large. Hopefully the small bases are 20mm (13/16") not a 0.5 inches (13mm)—I've only seen movement trays for 20mm bases at the smallest.