rodwha wrote:
If the lines have been blown why is antifreeze necessary?
And what of the fresh water lines/tank? How do you ensure this is cleaned properly before use?
When blowing out the lines you run the risk of water getting trapped and never draining completely. Some run antifreeze through the lines afterwards to displace what little water, if any, that remains. It's kind of like cheap insurance.
Don't bother putting the pink stuff in the fresh water tank. Just drain the tank the best you can. The little bit that remains won't cause any problems. Run the pump to clear the lines that run from the tank. If you would like to add antifreeze, check to see if your trailer has a winterizing kit installed. You can use this to pump antifreeze throughout the lines without having to dump it into the tank. If there's not one, they're pretty cheap and fairly easy to add.