@Hallback that is why it was drummed into my head to do EVERY POSSIBLE THING to avoid hooking heavy iron to trucks. I was not as swift as the guys who were learning me this. Being a farm kid who just 'got it done', it took a lot of pounding
I remember I built a dam across the irrigation runoff ditch and had all my toys out there, army men, dozers. I had a boat launch, roads, wood block buildings. I was probably 8~10. My older brother was tilling with the mitsubishi, and stood up to admire all my handy work. He was not aware of how big a soft spot I had made in the berry field and stuck the tractor hard. Dad chained the pickup to the tractor and two cars and all the rope and chain he could gather to get it out. Nobody was mad at me, they all liked the engineering and could see how brother could get stuck looking at it
So I wanted to hook onto anything and less experienced truck drivers wanted me to, and that farm boy in my took a while to get calmed down.
It all fell down to " you hook onto it, you break it, the boss buys it and you walk"
When you own both sides of it, and the boss says do it, then I was in the clear.
I guess what I am saying is, I don't give two craps about the size of the bumper bolts. The D8 guy stayed in, the truck guy let off, and I guarantee that something will break in that formula. There is just too much traction in those interlocked axles with ?? pounds over them, going uphill. The D8? Well yeah we know about that.