I've never had or used a solar panel of any type. I sometimes run my Honda EU2000I 2000 generator a couple hours every day while camping (to keep my wife happy watching the Weather channel and a few other programs) and that usually recharges the battery.
As far as your new W/D hitch...one word of caution...make sure your RV dealer installs the W/D hitch correctly. I've read a few times on this forum that some mechanics (techs) at RV dealers have little idea the proper way to adjust and setup a W/D hitch. And if it's not set up right, it's as good as not having one at all.
I set up mine own W/D hitch after reading the instructions a few times along with a lot of good advice I found from members on this forum. If you have questions on your W/D hitch, do a search on this forum, under "weight distribution hitch", or "Sway" for some of good info.
Here's a recent thread on this forum concerning a dealership that set up a W/D hitch:
Help fix my white knuckles!!!
And here's a link on this forum to the search subject "Sway":