Rental vehicle after 10/15/minutes of driving -you had to use both hands on steering wheel vehicle wanted to drift in and out of lane of travel-very hard to steer often referd to as white knuckle driving interstate speeds 70mph-passenger seat was not locking -seat was traveling back and forth.we were hit from the rear.all traffic had stopped- it was then discovered that passenger and drivers seat belts were not working they were not engaging locking device