Extend a shower rod

[youngguy]

Hello,

I have a Coachmen Clipper that I am wanting to install the Extend a shower rod in. The current rod is mounted to the side of the shower surround, I am going to try to get the new rod installed in the same spot.

My question is, What kind of Wall Anchors should I use on this? Drilling into the outside wall makes me a little nervous.

Any tips would be very helpful.