Honda CR-Vで大人3人子供二人で乗った事がありますが、
結構きついです。私がチャイルドシートの間に座りました。
体型は身長150cmで体重100lbくらいです。
なので、大人3人のうち小柄な人がいないと厳しいと思います。
また、チャイルドシートに関しては、 http://www.dps.texas.gov/director_staff/public_information/occSafetyPrgmFAQs.htm
によると、
Texas law does not specify where in the vehicle a child is required to ride – BUT – the law does require that all child safety seat systems must be used according to the owner’s manuals. ALL rear-facing seats are prohibited from being used on the front seat of the vehicle if there is a passenger air bag. The only way the rear-facing safety seat can be legally and properly installed on the front seat of a single-cab vehicle is to manually turn the air bag to the “off” position. If your vehicle has “smart” airbags designed to deactivate or depower themselves based on information received by sensors in the front seat – these types of airbags are designed to accommodate small adults – not for the installation of child safety seats. Also, some manufacturers prohibit using their products in certain seating positions of different vehicles. Children are safer if they ride properly restrained in the back seat than if they are in the front seat. Follow the vehicle manufacturers’ requirements and recommendations to keep all children 12 years old and younger properly restrained in the back seat. A multi-year research study conducted by the American Academy of Pediatrics in trauma rooms across the U.S. determined that children younger than 13 years old who are sitting in the front seat during crashes receive far more traumatic and fatal injuries than the same age group of children riding properly restrained in the back seat when the vehicle is involved in a crash.