I know this question has been discussed in the past but after reading all of those discussions I'm still not finding my fresh water tank drain. I recently bought an older 2012 Big Horn 3455RL 5er as a project trailer. It has a long history of neglect and I've solved most of the problems caused by the former owners lack of care. I'm just now turning my attention to the fresh water system. I want to sanitize the system and in that process I can't seem to find the tank drain. I've owned several similar 38' trailers over the years and all of them have had a drain under the belly somwhere. I can't find a drain under this trailer anywhere. Not hidden near the axles where its harder to spot or anywhere. The whole belly is covered nicely and is undamaged. NO signs of a hole where the drain may have been pushed up thru. I'm stymied. Can someone help me crack the secret location code? Was this manufactured without a tank drain? Is it about just running the pump until the tank is below the level of the pump pickup? Thanks for any help you can give me.