Just about finished my Smoky Mountain Model Works AAR 53' 6", 70-Ton Flat Car. I used a wood deck in place of the supplied urethane deck. Being what I call a "runner" on the layout I used Kadee couplers for switching.
I can not find any pictures of this type of load where chains were used. MOW load yes, old tractor loads no. The specs call for wire so using stranded Clover House cable.