Ah, good ol State DOT sign/generator/light trailers. The few of these that I have been around seem to be built pretty robust and when fresh from the state, well maintained (at least in Kansas). Both of those trailers have decent sized hubs with 5 lug wheels, so I would expect them to have at least a 3,500lb axle.
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As a tent transportation trailer the small one might work, but it is super short and will need some mods just to make it pull nicely. If the larger trailer still has the sign support installed I could see that being utilized as one heck of a solar array. You could probably build it to power a small village, or potentially one EV, or just camp.
By the time you are done with the build of a used trailer, you have cut and modified practically every piece of the trailer. Not to mention the time it takes to clean and prep the old material for those modifications. I know a lot of us take this approach whether it is for a decent base to start from, ease of titling, or fabrication ability. In the end, it probably would have been more cost and time efficient to buy material and start from scratch.