The next time the tank is empty, or nearly so, go ahead and pull that bottom plug. Then install a short pipe nipple that goes through the hole in the bottom of the cab, and add a petcock valve. Then the next time you need to drain, just turn the handle.

Of course, if you park it outside overnight, the guys with a Kentucky credit card will have an easy time draining the tank, too!
Jerry

"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!