The picture was found in a thread here on the forum Seems as though a simple issue is a very confusing issue Do a search on water heaters and you will see what I mean. Now, something as simple as what that pictures shows makes me wonder why the manufactures don't include it in the owners manual. Even if a bypass hookup is an option.
Yes that is the position you want the valves in when you winterize the camper. You do not want any anti freeze solution in the water heater. BUT make sure you drain the water heater or else the attached may happen