How much does a 1967 440 john deere skidder weigh?

I have a '67 JD440 with a 239 Diesel in it (the original engine was a 219). Fully fuelled up with 120 ft. of mainline, calcium in the tires, and 12 inch channel steel extensions between the frame and the skidding arch, she weighs in at 12,960. Close enough to 6 and a half tons for me.