Welcome to the forum:
We have the sister ship with a 2008 Endeavor SKQ.
This is a great forum and if you want modification ideas I have made so many I quit keeping them on a list. Seriously, there are so many fun things I have learned and changed to make this really a comfortable full timing RV.
In the following link is a tremendous amount of information gathered since new, including a copy of a factory CD that I purchased as they filed bankruptcy. There were not many left and I'm glad I got one.
I highly suggest downloading all of the files when you have a good internet connection. There is a read-me document at the top of the files to explain how to use them.
Many files are PDF's and have notes on them. Mouse over the notes and click if needed to make them pop up. The notes are information gathered through personal experience or through this groups efforts.
You will find a youtube on how the EMS panel works. This is from the original cd's as well as a few others.
There is a reference and video of the Lazy Daze driving course that I highly recommend if this is your first monster rv.
As for modifications, where do I start?
Are you looking for more power???
Replacing the Refer?
Making the water bay more user friendly, overhauling the entertainment system cabinet?
There is not much that has not been worked on or modified in some way. If you enjoy working on projects get a large note pad and always keep it handy for making that ever lasting to-do list.
Your Battery bank and charging systems can be very intimidating and make for a steep learning curve.
So before I scare you away, once again welcome. This is really a great place.