I have a Cougar 31SQB and my pump is in the bed room on the side of the bed. One side of the bed has a "laundry shoot" into the storage area and the other side is the pump. I tried like heck to get mine to pump from that area but the hose is all crammed in there with a kink so it was a serious pain in the butt last winter. I am going to dump antifreeze into the fresh water tank and do it that way.
I don't know why that would be bad? They recommend putting a little at the bottom of that tank as well as the gray and black tanks. When I flushed everything out I ran water and bleach in the fresh water tank and lines and let it sit 24 hours. After that I pumped that out and put in water and some Arm and Hammer baking soda for 24 hours. Pumped that out after that and never had issues with taste or smell.
2011 Toyota Tundra, 5.7L, Double Cab, 4x4, Tow Package
2013 Keystone Premier Bullet 33BLPR
BlueOx Sway Pro WD Hitch
Husky Escort Time Ramp Brake Controller (need an upgrade)
Air Lift [Load Lifter 5000] Air Bags