Here comes another one. Looks like a camper trailer in tow.

Again, look at the overhang !!!!!!

Note that in all these dual-cab shots, the distance from the back wall of the cab to the centre of the rear wheels is only about 2 feet max - to keep a balance centred on the axle the whole tub can only be 4 feet long, which is pretty much useless. Other dual cabs have the axle much further back on the chassis along with an appropriately larger and more useful sized tub.

Way back in the 60's I worked for a national electrical contractor - they bought a couple of brand new Toyota Crown utes (yes, there was such a thing). As an apprentice I was required to drive one when the regular driver had his holidays. The first time I drove one was an experience - I backed into the yard and the yard crew loaded up a pair of triangular cable stands and about 20 cable rollers - all up weighing about half a ton (supposedly a three-quarter ton capacity). I drove out the gate, turned the steering ... and nothing happened, I went straight up over the far side footpath - the front wheels didn't have enough contact with the ground. We measured up the tray and found the rear overhang was more than twice the front overhang. They moved about 15 of the cable rollers to the front passenger footwell and front passenger seat. Needless to say I drove very carefully to deliver them to the job site. After that I refused to drive the Crowns again, only their Holden utes. The Crowns only lasted about a year before they got rid of them !

1; If those trays were secured properly up near the cabin it should actually make the rear end stronger by being a second frame rail.

2; If these have stock leaf spring suspension the overhang would only be from behind the rear mounting point for the leaf spring not the axel, if they have fitted airbags it would help explain the damage.

They are and you're right
But if you look at the photo's they have been modified to have extra overhang, If it happened to an unmodified vehicle, do you think the manufacturer would leave it as is?

No, the axle is the fulcrum, it depends upon whether the load is in front of the axle or behind which way the load is going to act upon the chassis.

The axel is the pivot point but the load is shared by each end of the spring.

And the spring pivots on the axle that is the ultimate support for the vehicle. When you are measuring for the lever effect you use the points where the vehicle is supported above the ground.

But we are not talking about the support of the vehicle we are talking about the support of the tray.

The two are not mutually exclusive