To the original poster you should be fine if you had a moon roof in your 3rd gen. Am 6' and have no problems with head clearance. Decided to buy mine at the last minute. Did not want a moon roof but most sliding cargo decks come with a moon roof. The sliding cargo deck keeps from scratching your paint when loading heavy, bulky items in the rear.
Been using the moon roof a lot this winter but now have started using the AC now that warmer temperatures are back here in Florida.
good luck in your search....Jim