Good call on the first steps. I'm doing LEDs too.
Once you think you are ready to go, camp in your driveway for 2-3 days. You will quickly remember what you forgot to pack, and will get to test all the stuff in a more real time scenario. Spend a day on power, then 2 days 'dry' camping(No plug-in from the house) to test your systems, battery capacity, and your own proficiency operating stuff. Don't forget to operate the generator for a few hours at the end of your driveway trip, to ensure it charges batteries properly. Then you can drive to the nearest dump facility and dump your tanks (confirms you have proper connections, no leaks)
During your driveway stay call your insurance agent and ask about roadside assistance if you should ever need it (how far will they tow you?), and glass coverage (repair and replace) Tow trucks for these things can be really expensive.
This will allow you to start adventuring with more confidence, have more fun and less stress on your first trip.
Something you should know: you don't have a spare tire. 22.5's are big, heavy, and the tools needed to change them are significant(lugs are torqued to 450-550 ft-lbs, you need a 25,000LB jack to get the back end up...) If you ever need it, just call any big tire dealer or truck shop and they can dispatch an expert with a tire to fix you up, where ever you might be.
2003 Fleetwood Discovery 39L