Moving large square bales, with no machinery. Let’s do this.

[LittleBittyBigJohn]

I bet if there is any old industry around you, you could find some old roller gravity conveyor sections to throw in the bottom of a trailer. We use probably miles of this stuff at the plant where I work. It comes in a bunch of widths. I doubt you would need the plywood that I've seen others recommend. You would end up with a bunch of rollers under each bale.

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[airbiscuit]

Both of those might work, but they put a lot of hardware on my truck I really don’t want just to satisfy a few customers, who are unprepared to buy or feed large bales anyway.

If you have a winch on your truck, it wouldn't be all that hard to fab up a detachable roller that just pins on the back of the bed. If you don't have a winch, just make a detachable mount (receiver hitch) for the winch on the back of the bed.

 

[zzvyb6]

Don't laugh too hard. I bought a 4' by 8' sheet of polycarbonate ('Lexan') for $40 at the local auction in Webberville. Then I use a FRONT mounted winch on the truck to pull a strap on the bale. I place the winch cable under the truck and onto the truck bed before the bale is loaded, and wrapped around a pulley block at the REAR hitch, so when the cable is pulled the bale gets yanked almost off. Then just drive forward to finish the act. I started doing this with stacked small squares way back when. Now it's any load.
Make sure the space under the truck is sliding-cable ready (i.e. suitable friendly clearence). Plus, depending on the baleage, the Lexan may be slippery enough for two grunts to pull it off. The Lexan makes a huge difference in the sliding friction. Yes, you need to peel off the protective coating on one side.

I believe there are some Youtube videos showing guys unloading stacks of squares from hay wagons for delivery using the same method. That's where I got the idea from. My NH stack-wagon essentially does the same think for partial loads of smalls.