Mud flaps and towing

Over the years my mud flaps fell off. I probably have some lying around here and there. I don't want plastic ones again, they're not compatible with my driving terrain (occasionally)

I'd like to replace with rubber flaps, and don't even mind cutting them myself if there are templates available/material can me recommended by forum members.

Also, I've seen commercial trucks having some sort of "skirt" on the bumper as secondary mud flap, I assume it's to minimize the dirt sticking to the camper.. Anybody use those/recommend?