1) I highly doubt it has any prewiring for solar if your talking about roof panels. If it has been prewired for portable panels then there would be a covered plug on the side of the coach. Furrion is the most common brand I've seen.
2) It most likely has the mount for a back up camera, not the camera. Again I bet it's Furrion brand. If you buy the kit, it will have the camera and wireless monitor. Camera gets power most often from the clearance lights.
I have to ask, Did you see the trailer or buy on-line?
2012 Copper Canyon 273FWRET being towed by a 1994 Ford F350 CC,LB,Dually diesel.
Airlift 5000 bags, Prodigy brake control, 5 gauges on the pillar.Used to tow a '97 Jayco 323RKS.
Now an RVIA registered tech. Retired from Law enforcement in 2008 after 25+ yrs.