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I am not even 5' tall so my seat is all the way up. I would also get the third row seats. We do 12 hour trips often in our Navigator. Do you still think it would be too small?Borderline at best. I drive with the seat almost all the way back and the way the front passenger dashboard is designed is leads to the front passenger typically needing to set his seat back also. Leading to less room in the second row. 12 hour road trips are way too long to begin with. Being 3 across with limited room would drive anyone mad. You need a bus for regular 12 hour road trips....geez...
I would say no.
I have 2 kids + large dog. Two kids are in the second row with the middle seat free which we use for luggage. In the back I put 1 chair up for luggage and the dog lays on the other side.
With one more kid I wouldn't be able to do it. I would get a roof box. There is really no room behind the 3rd row. Maybe 6-8 inches at best.