A neighbour has an Enclave and they park it in the garage. Not sure if it has power mirrors or not.
As for a garage test drive, I test drove a Acura TL and parked it in my garage (with the salesman). I then moved my 2 stage snowblower out, to ensure all will fit, and that the blower can exit thru the TLs garage door without having to move either the Odyssey or TL.
Salesman said many customers do the garage fit on test drives, but it was the first time a prospective customer then navigated a snowblower behind it for fit.