This may sound a bit woos*ss, but if I was doing that, I'd have put a chain between the rig and rope. Ropes have a lot of tension in these situations, and if they break, they have a lot spring force that heads right at the tiedown. A co-workers son lost his life from a stretched cable (not a rope though) breaking. A chain will absorb most of the rope stretch if it breaks. Woos*assnes over.
Not woosiness, a fair bit to go wrong with that situation. There was noone within reach of the rope other than me in the cab though, and the rope used was low stretch soft braid with 4800kg breaking strain so was pretty comfortable with breaking risk. Less comfortable with tree heading the way of the lean and taking me for a ride though, hence why was reversing versus towing. Recoil of wire rope is scary