Two noise sources on slideouts:
The sweeps along the side of the slideouts will squeal against the siding depending on how dry the siding is. There is a spray on coating to stop the squeal.
The slide mechanism depending on what it is (mechanical or hydraulic) may squeak, rattle, clink, click, motor/gear grinding...etc. Usually lubrication will quiet this down.
On our 5th wheel a piece of sheet metal was contacting the slideout ram and made a terrible noise (AKA-fingernails on chalkboard) until I discovered the piece of metal and bent it away from the ram.
So yes just like garage door openers there will be some noise when using opening or closing the slideout. I would compare it with other models at the dealer to see if the sounds are similar.