What is the make and model of the water heater?
There are exceptions but GENERALLY
Suburban has an anode. this is properly called a sacrificial anode. it's job is to sacrifice itself to protect the tank from "Rusting" (Corroding) out.
Atwood.. usually does not. This is because the tank is made of a different metal that is resistant to corrosion
NOW: some folks will put the spigot in the atwood... Differing types of metal (The brass of the spigot and the metal of tank) Tend to corrode .
Home was where I park it. but alas the.
2005 Damon Intruder 377 Alas declared a total loss
after a semi "nicked" it. Still have the radios
Kenwood TS-2000, ICOM ID-5100, ID-51A+2, ID-880 REF030C most times