Ya - finding a MODEL that will fit enough carseats is key ... if I were 'skinnier' my van would fit 5 x the 5 point harness cause the one sit will flip foward with a forward facing tethered chair in it cause it tethers TO the chair base - however my boobs and butt are way too big to 'squeeze through' the space that is left to get into the backseat to do up the back two kids belts - so I can only travel if I have a child who is 40 pounds, 40 inches and ideally 4 years of age to move to the booster seat which allows me to properly flip the seat out of the way to get in there ... I could SQUEEZE back there if I HAD to I just prefer not to cause I have a bad back ... if you were thin and had a good back you could easily have 5 carseats tethered into the Montana ... mine is the 8 seater 'extended' version not sure if that makes a difference!