First off, I like seeing the word "Spring-erizing" in December.
It brightened my day. (It is 40 and raining here)
I get the bleach out ofour tank by diluting it. After letting it sit with the initial bleach mixture I drain it, fill it, let it sit for about 10 minutes, drain it, fill it, let it sit for another 10 minutes or so then drain it again. That seems to take care of the bleach for me. While it is sitting with the "fresh" water in the tank I use my city water hook up to flush out the lines. That way I know the water that I am using to flush out the lines is bleach free. I have heard of some folks using baking soda to "remove" the bleach smell and taste but I have never felt it necessary. I never thought about "tipping" the 5er. If you knew which side of the tank the drain was on you could pull it up on some blocks and that would lean it maybe enough to improve the drainage. You got me thinking now...I may try bringing up the nose or lowering it with the landing gear to see if the drain is maybe at the front or back of the tank. I am going to have to sanitize our tanks ina couple of weeks for our Disney trip so I may try this if it isn't too cold when I do it.