Like Ronmar says, you won't have much luck trying to skid logs by hooking the tongs to a chain attached to your drawbar because the log will roll and the tongs will loose thier grip. Attaching the tongs direct to a drawbar between the lower 3 pt links will usually not give enough lift height either. The best way is to hang them from a 3 pt boom so you are lifting at an angle from above. Gravity will keep them firmly attached, the log will not roll, and the front end can be lifted so the log stays clean and it won't hang up. On a normal log, the front is the only place it will hang up on a straight pull and you only have to get it up a few inches off the ground so safety is not an issue. This method is much more efficient than wrapping a chain around the logs because you dont even have to leave the tractor's seat to do it. Getting a chain under a heavy log on flat ground is seldom fast or easy. Tongs are not usefull for much without a lift boom. I have dragged hundreds of logs this way and never had one hang up and lift the front of the tractor. I have also used this setup to lift many logs onto a trailer by grabbing them at the center but I do find front loader-mounted forks to be more efficient for this task. The only way you could get into some trouble with this method is if your tractor is not big enough for the job. I cut the logs small enough so I can lift the entire log with either the rear boom or the front loader. Lifting just one end to skid is very safe for logs this size. Most booms have multiple hookup points and the heavier the log, the closer to the tractor you should attach the tongs. Any log I cut for firewood I can handle with the outermost point on the boom. For some of the larger, lumber logs, I move the tongs closer. Most newer tractors have lower link stabilizer bars which will protect the lower links from damage while using a boom to skid. One thing to consider about safety is that using less efficient methods (ie: dragging a log with a chain attached to drawbar) will force you to hurry the job and more likely result in an accident.