Barry Sonnenfeld's broad family comedy 'RV' casts Robin Williams as a stressed executive who hijacks a planned Hawaii vacation, renting a lumbering recreational vehicle to sneak in a business meeting in Colorado while pretending it's a bonding trip. Predictable slapstick ensues, much of it involving runaway sewage and an over-friendly RV clan led by Jeff Daniels. Williams works hard, but the material is strictly formula, aimed squarely at undemanding audiences. Critics were unkind, and it stands as one of the lesser entries in his comedy filmography.