Any ideas for a cheaper version?

Cheap load bar from Harbor Freight and then visit the farm store for the feed trough that mounts over the tubes of a gate.

 

Sorry that this is a bit different, but I have a 108qt Plano trunk in my bed. I like that it has wheels on one end that makes moving it around very nice.

Pretty good price still:

https://www.homedepot.com/p/Plano-Black-108-Qt-Waterproof-Storage-Trunk-PLA1919WP/309646671​

There is also a 56qt version, where you could have two side by side?

https://www.homedepot.com/p/Plano-56-Qt-Sportsman-Trunk-Black-161900/308744534​

Regardless, it is hella less money than the thing that you posted.

I have mine strapped into the corner on an added D ring so that my fridge fits in nicely. But, it could be tied down across the rear near the TG.

 

This is exactly what I have. The green one and the black one. I like the black one better I think because you can completely remove the lid whereas the green one is hinged. They fit under my tonneau cover too. I have the 2 of them across the bed and they don't move BUT if I were bumpin' around off-road I would throw a ratchet strap over them using my molle side pieces (highly recommend those too)

 

What about a kids sled like this? It's 48" long.

https://www.cabelas.com/shop/en/flexible-flyer-winter-lightning-2-person-sled

 

Yeah. The removeable lid in black was what I specifically wanted and had to wait on it to be in stock when I was looking. With the black strap, it is a bit harder to see in the Softopper.

 

i also have one of these $30

 

@tonered that 56qt maybe what I'm looking for. A couple of them would be ideal I think. Thanks!

 

Good stuff!