Who Knows What These Are For?

Not my photos. I found these photos on a Prime FB page.

Solar panel to keep batteries maintained on a truck that's going to be parked for a while?

My guess would be the same as Harvey’s. Solar power trickle charger.

Or, maybe, a Japanese style outdoor dining table?

Solar panel to keep batteries maintained on a truck that's going to be parked for a while?

You got it! At least that's what the consensus answer was among Prime drivers. I'd never seen this before.

Or, maybe, a Japanese style outdoor dining table?

Incorrect, as I'm sure you already knew. But you get partial credit for creativity!

Solar panel to keep batteries maintained on a truck that's going to be parked for a while?

You got it! At least that's what the consensus answer was among Prime drivers. I'd never seen this before.

Okay, but where are these stored when a trailer is attached?

Based on the condition of the 5th wheel, and the truck number missing from the upper back of the sleeper, I'm guessing that the trucks these are on, are being processed out to be sold by Pedigree, which would support the trickle charge theory. Someone on that post said they were only on the Internationals, not the Freightliners, which if I recall, the FL have the master kill switch, and the internationals don't. That would lead me to believe battery preservation is the sole purpose for longer term storage. But let's be honest, a jump from the shop truck on the yard would be way less expensive than multiple trickle chargers.

Solar panel to keep batteries maintained on a truck that's going to be parked for a while?

You got it! At least that's what the consensus answer was among Prime drivers. I'd never seen this before.

Okay, but where are these stored when a trailer is attached?