I remove the INlet to the pump, which comes from my fresh water tank, and add a piece of hose about 3ft long. This allows me to submerge the hose in either a 5gal bucket of antifreeze or a 10gal bucket of water.
Before disconnecting the INlet to the pump, I drain the tank. My drain is on the passenger side of the tank, so I use my leveling system to raise the driver's side of the coach, allowing all water in the tank to drain.
The "two bucket system" allows us to use the coach on weekends by simply moving the plastic tubing from one bucket to the other.
4-down is the easiest way to handle a toad. Blue Ox makes a great towbar and baseplate. Very easy to self-install if you know which end of a wrench to hold. You have no trailer or dolly to store/maintain. Connect/disconnect takes about 2 minutes. Many vehicles with auto transmissions can be towed 4-down. We use an HHR, perfect vehicle for us, and there are many others that fit the bill also.
Jim