I should know this as we hauled the M101 in the 60's and 70's but can't remember where the safety chains go on the '715. The M101 I got from GL is 100% stock and those chains will not fit on the rear shackles and are not long enough to wrap around the shackles. I won't be ready to tow for some time but this struck me while reassembling the rear end of my truck.