Eat your hearts out. Nice to see all you envious guys wanting to try to keep up with us Liberty owners.
I was surprised to read that the Headhunter pump has such a short lifespan. That is inexcusable. They cost more than my copper plumbing yet they need to be replaced in less than 10 years? It's not like these pumps get excessive use.
On my old Liberty (the one with the shiny copper pipes) I have a DC motor driven pump. On our coaches any time we have a single component in a critical system we face the risk of a failure really screwing up our day. All of us that have a single pump are in that position. To allow me to not have to worry about what I was going to do if the pump failed I added a small Shurflo pump into the system as backup, only used when the main pump fails. I test it periodically to make sure it is OK.
If I had a Headhunter I would consider a backup pump manditory based on Mike's comments.