It's to the left of the genny as you look in from the front. It's about knee high. it's not a typical looking tank. The tank is the shape and size of a shoe box. The cap is dead center. Everything is mounted to the tank and there will be wires everywhere that you'll have to fight through to access the cap.
Don & Mary
2019 Newmar Dutch Star 4018 (Freightliner)
2019 Ford Raptor