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Hold, as in static, is a world away from hold while going down a riffled dirt road.
One major pothole in a paved road at 70mph can add many multiples to the static weight.
So 300lbs can easily become a 1200lb jolt.
Example:
Sit a coffee cup on your foot.
Now drop the same cup from waiste height onto your foot. .
What's your plan?
I have replaced one of my rotomolded bins with metal sheet, welded braces, bolted to the frame, built an exoskeleton.
It held an easy 800lbs and went over some really really bad road while doing it.
I have built another between the rear frame rails where many people carry their spare. It will hold about 2000lbs very easily but due to handling(tongue weight) should hold only 800lbs(ish).
The bins you ask about are limited by how they mount to the body.
They probably won't crack or bend, but they will pull off of the screw heads.
I think 200lbs while on the road would be a bit much without reinforcement.
The rotomold bin I removed won't hold 15lbs by itself without seriously flexing. It's rigidity comes from the flat wall it Mounts to.
Punchline:
$300ish to a welding fabricator will relieve any doubt.
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