I'd go with whatever mounting solution FWC has at the time of installation. I upgraded my turnbuckles to some marine hardware with eyes instead of hooks, but you can do that after you see how it fares.
With more solar and a rack I'd consider the stronger 40lb lift struts, unless you're going with one of the new lift options.
They should be able to point out where the current wiring goes. Nothing exterior AFAIK. Not on my 2023. But I'm not a fan of wired lighting, outdoor or otherwise. This is yet another reason why I use wireless. They do always have that rear porch light with interior switch; maybe you could tap that circuit depending on amperage.
And you'll need something to get into the back. Step stool or ladder, hitch mounted step, etc etc. And something for the sink to drain into.
Does the porch light have an interior switch? From the demo videos I've watched you have to switch it on the fixture itself. I always thought this was a little silly, having to already be outside to turn on an outside light. What wireless option do you use? I'd like to have some perimeter lighting for setting up camp, cooking, and for when things go bump in the night.