I usde allot of drags. 8 foot chain. I am out west. I use drags where there is no scrub, no sod and nothing. I stole this photo from the internet as it represents clearly my country.
Bottomline if you put the correct length of chain the drag will work. No different than rigging a boat anchor correctly. Often it may take a 100 yrds or for the drag to tire down the yote. I asked Andy Weiser at the National Convention about chain length and he and I agree that for our terrain 8 feet of chain works well. I belive O'rgorman uses the same.
Wolfdog I don't know the weight of your drag but if its close to 2 pounds, it will work.
BTW Beav, yotes seldom will double back, unless they are hooked up in lets say some plum thicket. In the open they may go left or right but I have never had one come back towards the set location.
Ill also say this, drags work well when trapping close to roads. Which contain some ideal set locations but the fear of getting your rig stolen and a yote is real. So use a drag and let the yote hide itself. I will caution you though, youll save allot of time if you combine a dog on the line when you use drags. Even in my country, yotes hunker down and can hide in front of a poke plant and you'll never see them till your right on them.
I carry 50 traps rigged with drags and if I get a freeze thaw situation, Ill use them all.
Wolfdog...I make make a few like yours and give them a try this season, they look heavy and heavy is good.