"I purchased the 100', up to 85 lbs, trolley system from my local Petco. I set it up from tree to tree, and it has worked nicely. My husky mix (32 lbs) and black lab mix (50 lbs) can run on it fine (seperately, of course). The only thing that I wasn't satisfied with is that, even though it states that it's rust resistant, it's NOT. After putting it up, within' 2 days, it was already starting to rust. I bought it maybe, a couple of months ago, and it's now so rusted that when I tried opening the clip today, it wouldn't budge. It took two hands and a lot of strength to open the clip. I don't know what I would use as a line to hook the dog to it later on, as I know, soon the clip and the metal part of the trolley wheel will be so rusted that I can't use it anymore. I hope I can find another way to hook a lead to the main trolley line (I've already tried hooking a normal clip directly on the line and to my dog's collar, and it wouldn't slide), otherwise I won't be able to use it at all anymore, in which case, I would NEVER recommend it or buy it again, since it would have to be replaced (by buying a whole new one) every couple of months."
