You must have the "Atwood" water heater. They do not use a anode rod.
Correct, Atwood uses aluminum for the tank. Surburban uses a ceramic coated steel, and needs a sacrificial anode for protection..
I was surprised when we picked up our Heartland several years ago that the HW heater required an anode. Our previous, year 2000 trailer did not. I thought theyhad gone the way of dinosaurs until we bought the Heartland. About time they joined the "new age". Now for good tank monitors......................
utube has a video on cleaning your suburban water heater to get rid of sulfur smell using 5 gallons vinegar in the winterized lines for your water heater I don't have the link but watched it havnt done it yet as mine dont smell yet but I changed my anode rod after 11 mths and it was down toa wire lol bad water in the desert .Is the anode rod related to sulphur smell hot water? I had that last campout, but was able to run water through the HWH twice (heat it up, run hot water into drain until cold, repeat) to get rid of it.
I located the you tube video Wmnmy indicated. The link is below:
http://www.youtube.com/watch?v=QjEPy21nIrQ
According to the video the vinegar is to remove tank scale and is done very much like winterizing with antifreeze using your water pump. May try this in the spring before using the trailer.
The hydrogen sulphide gas (your bad egg smell) comes from sulphur bearing bacteria breaking down in the hot water, aided by the anode rod. Some sites suggest changing to an aluminum rod if you are using currently using a magnesium rod and getting the smell.
To get rid of the odour the water heater can be treated with hydrogen peroxide or bleach. Instructions can be found by using Google.
The original rod in ours was worn out after the first season. I assume it was an OEM Suburban. I replaced it with an aluminum rod and it still looked relatively new after two years. I replaced it with another OEM and after a few months it was showing lots of wear. I guess we had better stick to the OEM rods.