what is the deal with the new carseats these days? with the 3 point latch system and the regular seatbelt? my wife seems to think that our daughter cant ride in a car not set up for the latch system, i dont really think it holds the seat any tighter myself. do you guys think it is really neccesary to use both? i mean both of our cars have the latch system but, my other truck dosent, since our dd's have it i use it, but is it really, necesary?