Without any more information than the length, it would be impossible to guess the weight, but I'd say the other guys are definitely in the ball park and pulling it with a Ranger would not be smart. A brand name might help a little with guessing the weight, but it would still just be a guess. I'm assuming it's pretty old and worn so the data plate doesn't show anymore? On most of them, on the left side, lower front corner, is a data plate that shows the GVWR, but of course that doesn't tell you what the actual empty weight is. Much depends on the type of construction. I once had a 25' long trailer that only weighed 4400 empty, but I also had an 18 footer than weighed 3800 empty.