Finally, here are the photos a couple of you (James & Ed) asked for. As a recap, I found it next to impossible to connect the bayonet mount of the sewer hose to the gray/black tank drain. Once connected, I decided to leave the hose connected until it needed to be replaced. The other problem was misalignment of tank drain with opening in floor of compartment. It takes at least a 45-degree+ turn in hose to go from tank drain to hole in compartment floor. The sewer hose I'm using is a 10-foot "Viper" brand.
I can coil the hose to store it in the sewer compartment. The hose collapses (accordian style) somewhat which reduces its length by some inches. This results in double hose coils in back of compartment and a single coil in front.
Even without compressing the hose, there is still plenty of room for it, but there are double coils next to compartment door. I also place the clear 90-degree elbos (connection to dump station pipe) on top of the coils. Everything seems to ride OK.
To store the hose this way takes one extra step, but less than a minute to do. To set up, I have to pull the hose out the compartment door and then thread it back through the hole in compartment floor. Same when unhooking--must pull hose up through floor hole, then out through the compartment door, and then feed it back into the compartment. Also, Ed, I think the tanks are emptying OK (sure hope so). I do give them a good rinse after dumping and then add water plus tank treatment. If you think this isn't sufficient, please let me know.