You're looking for a 10/2 romex line. Color coding began around 2001 so yours should be orange. I had a cabinet next to my panel, and enough extra romex to put it there.
I used standoffs when I mounted it to the floor, the bottom of the case gets a bit warm.
Also, before you run your remote wire for the display, hook it up and make sure it works... My first data cable was bad, had to re-fish a new one thru the floor.
2016 Flagstaff 27VRL with overloaded tires from factory
2015 Chevy Silverado