OBRIEN RINGO BOOKER 4 PERSON BOOKER 4 U Deck Series The new Booker 4 appeals to every driver who makes them feel how safe they are with the angled edges of the tube. With 3 grips along each side and 8 forward grips, riders have multiple grip options and direct guidance on how the tube rides on the water. SofTec top takes it to a new level and makes this U-Deck series tube a guaranteed winner. This O'Brien towable boat tube has a maximum capacity of 4 people or 680 lbs. Use a 4,100 lbs tensile strength tow rope.