Decades ago I drove my SUV to NYC to bring my son home room college, only to find he had invited his buddy to ride back with us. That included strapping gear to the roof rack for both of them. Also, I had to deliver a package to a shop in mid-town. Somehow it worked, but pulling to the curb by the shop and putting on the blinkers while looking like refugees from a dust storm took nerve.
Just yell out the back door “Pipe down!” or “Not tonight, dear!”