Its been awhile since I drained my tank and need to as soon as I take it out of storage, but I remember having the same problem. Did not find a rear tank and there was not a drain at the bottom of the front tank.
The best I could do was open the valve at the firewall and let all the air out of the system. It doesn't get the water out of the bottom of the tank, but it was all I could do.
Good luck.
Mike
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Mike G
2019 Newmar Dutch Star 4018 - Freighliner
2022 F150 Platinum or 1973 Toyota FJ40
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