I would do one about arms length with a loop on the end big enough to put the trap through so you can loop it onto something. That's just easy so things don't get all tangled. Then build a few 6' extensions. Attached both to the trap with a quick link and you should be able to work with that on anything you will encounter. If you are running a LOT of traps I keep different length cables in different buckets and hook everything on with a quick link. Nothing hanging off the trap to get tangled.