The last 2 are for pin box and suspension. I have the moride setup #1 and like it. the 6 point level up is great if you like ease of set up and break down. Again I like and enjoy the auto level function but I only stay for a month or less as I still own a business and trying to sell out in the next 18 months so I can semi full time. They are worth the money in my opion. Big Sky 3625RE (39.5 ft.) 15,500 pounds with moride pin box and suspension with 6 point auto level.Hope this helps you. Have fun and enjoy life on the camping road.