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As Kerry said - the Suburban water heater is not glass lined -- that is why it needs the anode rod. The anode sacrifices itself as it electro-chemically bonds itself with the various metals in the water you are using (this is one reason why most manuals say to not use a lot of sealing tape on the rod -- it must have metal to metal contact on the threads to work properly).
Regardless, you might find a small mirror (dental mirror perhaps), or a auto cylinder camera (I'm having a brain cramp right now and can't remember the proper name for this device). In any case, you can rent them from some rental centers or perhaps borrow one from your favorite mechanic (bore Scope is what I think it is called). This will let you look into the tank (with a small light around the lense even) and let you see what the inside of the tank looks like. I know when we went out east last fall we got a lot of reddish crysals from our hot water tank when I drained it -- we normally get almost pure white.
Keep us posted if you would.
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