I just bought a Trail Lite B+ 211s with 8.1 Chevy engine. This is my fifth motorhome (others range from an old 20' Vagabond, and three Winnegagos, from 19 to 32'. This vehicle is fantastic. I am...
Burl, You found the tank drain. It's pitiful, as you described. If you unscrew it at the tank fitting, you can pull it right up and out, through the floor. (If you want to try to make something better.)
The tank is not tied down. You can lift up on the opposite end to get a more complete draining. Mine was so crappy, I took the tank out to clean it. I messed up the level sender wires because I forgot they were hooked up.