Hi Camper Rich,
I bought the Hullavator for my Subaru this year and LOVE it!! I have a 17 foot kayak (about 55 lbs) and it is sooooo easy to lift up on top of the car, and makes putting the straps on very easy. I am almost 70 years old and it was getting hard to deal with.
I don't know how big/heavy your kayak is, but you still would probably want to take the kayak off the top of camper at night before lifting the ceiling. Not sure. Hullavators are heavy, plus weight of boat. You would at least need good lift pistons to lift both attached to the camper. I would probably need a step stool to use this as I am only 5ft.4 tall and reaching the locks, etc. might be a stretch.
When you go kayaking, and leave your rig for an afternoon, you will might want to lock the hullavator. Buy the locks! I have heard that they sometimes get stolen and as you know they are pretty expensive. If you have further questions, please feel free to contact me directly. Chris