If you have a new 22QB do not try and follow the instructions from FR that are titled 2015 Winterizing. The pictures in that document do not represent what Coachmen is actually building.
Here is the low point drains
Here buried behind the heater ducts are the Hot water tank by pass.
The water pump is not near the shower per instructions but behind a panel in the Basement
Close-up of the pump
Now I haven't worked out how to install the CAMCO By-Pass kit as Coachmen decided to mount the input line tight against the drain line.
The fitting they suggest we use is a special order part so if you decide to go that route plan ahead.
When / if i figure out how to install the by-pass kit. I will post the information here.
I write a blog on RV tire application and safety. RVTireSafety.com
Also give seminars on tires at RV events across the US. 40 years experience as tire design & quality engineer for major tire mfg. Freelander 23QB on Chevy chassis is my RV