Sounds like your safety man couldn't cut it in the field. Typical. Thinks he needs to make the driver's life miserable. All excavators have holes in one end of the undercarriage, some have it in both sides. Another option is they all have holes to access the grease fitting to tighten rails. Come through under the rail/over the frame and hook the hook into the hole. I could name more, but, not to be nasty, if you are in charge of tying down machinery, you should know all this. The only thing that matters is you need 30% more load securement holding backwards than forwards. This usually means 2 chains in front, 4 in the back. Tie down is an art, it helps to have hooks in your binders that will hook over the frame rail. I have binders that have a ½" hook in one end, and ⅜" hook in the other. Good luck.