Deciding between the 2 vehicles. Stuck between Escalade NOT having middle headrest (how bad safety wise is this?older kids neck def hit where seatback ends) and 3rd row seat so close to 2nd row (like bus seat close to each other) vs Expedition having middle headrests and ability to slide 2nd row forward so 3rd row passenger can has more forward excusion room). Booster will soon go to low back so I can't cheat out the no headrest thing in the Escalade. Also in either vehicle is it possible to put a Frontier next to a HBB like a parkway on a bench in either vehicle or do both seats need to be outboard to fit?