Perhaps the trap could be fashioned so that the bag could be closed over it
from a distance (in lieu of the original poster's fear of what might go wrong).
How that would work: I'm presuming the contractors' bags have a diameter at
least big enough to contain the length of a skunk-sized trap; so take some
wire, cable, or even stiff plastic and loosely tape it around the edges of the
bag to make a "hula hoop" or croquet hoop type structure. Place the bag
"inside" the trap but keep the bag open, with the hoop on the ground,
surrounding the trap. Attach string or wire to the far side of the hoop and
clip or weight the fore portion to the ground so that it can be pulled forward
sort of like the way a mousetrap works (and the bag drawn over the trap) from a
distance. Test your setup first to see that it works smoothly. Inventive
persons can add variations on how this is done, but you get the idea.
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