Fastener question (wall repair)

Hi There,

I am in the process rebuilding the rear wall on my 5th wheel. I need to replace some of the wood studs due to rot. The wood studs are screwed to aluminum framing. What type of screws should be used to attach the wood studs to the aluminum frame? Do people use self tapping or pre-drill?

Thanks!
Mark

PS Please move to tech section. Tried notifying moderator and got an error message.