Shifted load of lumber

Loose banding (not in your control) makes for sloppy bundles - doesn't look like they have any wood on the bottom of the bundles under the bands either, but you had nothing to do with that either. Now, if it was sketchy on the forks before it hit your trailer, that was your time to either refuse the load, or make some changes in how you secured it.

Single straps in the middle over 1st layer would have either tightened up the bottom bundles or shown the problem before the top bundles were loaded. 2" ratchet around both bottom bundles may have helped tighten them up also. 2x4's take a lot more to keep from moving around than 2x6's, and if you try to go too tight, it will want to make the bundle want to go round also, but at least the top wouldn't continue to telescope out sideways.

Hindsight is 20/20 and easy to armchair critic, but you didn't have enough securement.

 

I can’t tell by the pics, but did you alternate the tie downs, left to right, then right to left?

 

I did allot of Amish wood loads going to pallet factories. Lots of stacks and sometimes a pain. I learned quick to over secure. Threw in my 2” straps (I carried a bunch of) to supplement. Cinch strapped as well to compliment. Looked like an amateur with all the straps, but it’s what I needed to make it work. When I was done the banding would get loose. - Proof that it really was never tight to start with.

 

I ran super B & 40/20 on the Oregon coast & mts hauling lumber. Outfit policy was strap first tier & left to right always.
You can't use too many straps.

 

I'm allergic or react to either the fresh cut hickory, or whatever happened to be on it, but still crawled all over threading my straps. Was trying to make it a regular run, but the English guy that did the receiving on the other end for them was just a plain old miserable #######.

 

I’ve hauled bags of product, picture mulch, that looked like it was leaning a bit and used my pipe stakes to make sure.

Looks like you had a rough go of it. I’ve never met a soul that cinch straps stacked lumber before, but in your case it would have been helpful.