The only advice I could give not knowing your coach is that inverters are supposed to be mounted as physically close to the house batteries as possible. They aren't always close, but they should be. Maybe on the other side, but close to minimize the length of cable runs. Find the big positive (red ends) cable on your house batteries. Follow it, if you can. It should go to the inverter. Good luck and I would be very surprised if a 2015 Discovery did not have an inverter. That is a nice coach!
Jerry
Chief USN Retired
2003 Beaver Patriot Thunder C-12 505HP
2004 Dodge Ram 1500 4X4