I have a "solar ready" Kodiak Cub. It consists of a 12 volt socket next to the equipment bay door, a 12 gage wire leading to the nearby battery box, and a fuse.
Mostly it is good for advertising "solar ready". The only other use is with a portable solar panel that has its own controller.
Since it's only use is mostly for advertising, there is nothing in my owners manual either.
Some higher end TT's are pre-wired to the roof and have heavier cabling. That is more useful, but even they are some what limited and usually do not include a controller. They often have to be modified for what an owner actually wants to install.
I wish you good luck and happy trails ahead!