He has a good set up short of the wire inside they will work fine for everything but a coyote I believe as the wire alone will spook them I sell five foot long double doors for cats that have one of the best triggering systems made in my opinion, I only know of one coyote caught in them out of about 150 traps. Not that anyone is specificly setting for coyotes the guy just had the right bait at the rght time. If you are serious about trying to get coyotes in boxes, large is the way to go with an irristable bait in it preferably live and making some noise, just my opinion, I'm sure you can find some expert somewhere that would divulge his secerts some where, good luck in finding him or her.