Another possibility are 12v RV incandescent lamps. A 50w lamp will draw 4 amps. Hook a bunch of sockets in parallel and screw in the number of lamps necessary for the desired load. The light will remind you that the load is still connected and you don't need a cooling fan.
Another advantage of this arrangment is the more stable current vs voltage curve. When the tungsten filament cools at lower voltage, the resistance drops and it allows more current to flow than if it was a pure resistor. The current change with voltage is about half as much as with a pure resistor ie 10% lower voltage will drop the current by 5%. Just like the old Amperite ballast tubes that were used on some radios like the R390 to stabilize filament voltage. Burt VE2BMQ
