Tried posting last night but couldn't. That said just making an educated guess, I'd say each track frame is probably gonna be in the 1000-1500 lb range, if all of the bottom rollers are present. If no rollers knock off a few hundred pounds apiece. Even then I'd figure no less than 1000 each just to be safe. The frame part with the cylinders, etc is probably another 1000 to 1500 total. As far as the rear housing, if it still has the steering clutches, ring gear, etc it it, I'd guess somewhere around 2500 to 3000. If the ring gear, clutches, etc are gone, you could take a couple hundred pounds off of that.
In the end, like I said just making an educated guess I'd say the weight on the whole thing is probably going to be somewhere between 6000 and 7000 lbs. I might be a bit high, or a bit low, but as often as I pick up equipment parts I've found it's alot better to be on the high side than the low side. It makes life alot safer and easier that way...LOL. That said, just making an educated guess, but I don't think a 5000lb trailer is gonna be enough to carry it safely.