Washington Post | `RV' opens at $16.4 million, `United 93' debuts with $11.6 million San Jose Mercury News - LOS ANGELES - Audiences hit the road with Robin Williams as his family-vacation romp "RV" opened at No. 1 with $16.4 million, while the Sept. Box office: RV bumps United 93 "United 93" No. 2 at box office |