What have others done to add seating to your van? We currently have two seats in the front and need a third seat for our son and his carseat. Have others added a bench seat to the front? It's not ideal for me to have him in the front but are open to all options. Have you added an additional seat in the back? where have you added it? is it a swivel seat? We are hoping to maximize our space every way we can. What specific seats have you used? We are 100% new to this, but are handy and are confident in our DIY skills. Thanks for the help!