We just bought this 2010 Heartland North Country 26SRL. I am trying to check everything out and get it ready to go camping. I have circled the fitting that I think is supposed to be the location of the anode rod in the picture. It just has a couple of fittings in the threads to plug the hole. Is this where the anode rod is supposed to go and what length anode rod do I need? Your help is appreciated. The manual for the Suburban water heater is worthless except for showing how to light it. Thanks