For your age range, most mid-sized to Large vehicles will handle 3 seats. It will be a tight fit. We used to do it in an Alero with 2 forward-facing toddler seats, and 1 booster. We also did it in an Explorer. Take your tape measure: measures your seats side-by-side, and then measure the seat in the vehicle of your choice. I'm sure a dealer would be more than happy to let you "test fit" your car sears prior to purchasing. I agree with others that the Frod 500 would be a great starting point.