1. I like the ease of a rooftop tent.
2. I hate the idea of being cooped up in one during rain (where to cook?).
3. The D110 has a lower center of gravity then our lifed Discos.
4. I would probably forget it was a rooftop when having to pee in the middle of the night.
5. Unloading after a trip is more difficult with the rooftop unit.
6. Rooftop tents have a high "wow" factor.
7. If you camp with a dog, how do they get up there?

Here's an answer to some of your points.

#2. T-Top!   Where to cook is down below just like in a normal tent.  Plenty of ventilation and before you say "yeah, but all the fumes go up" this is no different than cooking in a normal tent when it rains.  Those sides come off too. 

#3 Hay!  My truck's lifted too!!   And as I recall, you had a lot of stuff in Quilomene AND two water cans (maybe one water and one fuel, maybe more) on top of your truck.  Those water cans are 40lbs each.  But alas, if I truely do have a lower center of gravity, I'm happy.

#4. Yeah, but you'ld only do that once before you remembered.    There's a whole thread on Expedition Portal about people using nalgene bottles to take care of that need, including links to adapters for women folk to do the same.  Personally, I'll climb down the ladder or just go off the side of the truck.

#5. This I don't under stand.  Flip it open and get the sleeping bags out (no need for pads).  If it's wet and you need to drive the truck then yes, you would have some issues.  But I hope to have a pulley system in the roof of the garage eventually so I can lift it off when I don't need it.

#6 Yes, it's indeed a luxury and not really needed.  But it does make life easier on the trail

#7 With the T-Top version I'll tie the dogs to the trailer hitch and they'll have beds down there.  Or they'll be inside the truck where they ride.  I thought about this for Craig but the little white fluffball (notice how I didn't call him Furcicle???!?!)has a cage and I image he'll be in the truck.

My parents said they have a couple that they don't use anymore.  I'll check those out, and also try yours out.  I like the price.  I know it does poorly in the wind, but is it dry?

Craig

Todd pointed out the Oasis 5.3 tent to me.  Nobody in the US is distributing them right now, but they look perfect for Julie, Soren, and I.  The dog can sleep under the truck or in his crate on the roofrack (If he'll fit).

The Oasis 5.3 is 7.9 feet wide, 8.5 feet long, and only 61 pounds.  For comparison, my roofrack flooring alone is 35 pounds (don't know how much the rack weighs).  It can be mounted on gutter mount Yakima bars instead of the existing roofrack to keep the total weight low, and access it via my existing roofrack ladder.

By storing 3 sleeping bags, pillows, and foam core pads inside the tent I can free up a fair amount of cargo space too.  I usually store these items in dry bags on the roofrack as is.  Storing them in the tent, already setup, makes setup/teardown of the campsite a breeze. 

Having slept in the Oasis 2 already, I think I'm sold on getting this tent.  I just need to figure out how to pay for it now.  A roofrack may be for sale soon.   Hmmm.... what else can I sell that's in my garage?

Here's another option.  Euro-cottonball stylee, sweet.