About the only advantage to a "solar ready" feature is that some wires were run to the battery and an external connection point.
Unless one purchases the specific setup the unit was pre-wired for, the only thing that will be used are the wires inside, assuming they are adequate in size for your "project".
As Flybob said, the pre-wire is usually for setups like Suitcase Solar units you just plug in, at least for the smaller RV's. These are usually over-priced for what you get.
The Solar Industry had produced lots of quality panels and controllers that can be assembled into a very nice setup, suitcase or roof mounted, for a lot less than pre-assembled (or packaged) units, provided you have basic mechanical/electical skills.
"A wise man can change his mind. A fool never will."
"Sometimes you're the dog, sometimes you're the tree"
2018 Flagstaff Micro Lite 25BDS
2004 Nissan Titan