Next time I'll probably just get some oil-filled electric radiators and put a few in parallel.
Chris,
Since I already had them, used to do that, but it took 5 heaters to do a 2 ohm load, since those 1500 watt 120V heaters were about 9.6 ohms. Dragging 5 heaters to the shop was too much work, and could only test one side at two ohms.
Then I found that wrapping baling wire around a brick worked quite well, and is even cheaper than Mark W's solution, but does have some heat safety issues
IIRC, using a 8"x 3" x 2.25" brick and 16 gauge steel baling wire at about 1/4" spacing came out to 4 ohms.
Art