Rocky,
You can buy rods with only one tip.
You can bet that if and when you break it, you will say, "dang, I wish I had that second tip."
It will ruin your day for sure, not counting the month or six months it will take to have the tip repaired or re-built.
So, why not? It is a pretty good idea.
I have never broken a tip in a car door. Mostly, it was trying to bring in a fish that was too large for the intended use.
Bill