Although.... with the wild boar maybe you can keep all your gear in the grounded tent (assuming it is self supporting), close off the roof tent and go. Seems that with AT you would need to pack out your gear to close it off every day (more work).
Why sleep on top? Maybe to stay away from bugs, animals, dirt, water.
With three little kids I am more of a cabin person right now than a tent person... just thinking out loud.
And by the way, Jeeps have different heights. I assume it has some level of adjustability for that... I wonder what the height limit is.
Clayton 4.5" suspension, 37" KM2 tires, Mojave wheels, Tom Woods front and rear drive shafts
Clayton/AEV high steering kit, Teraflex SS, Poly inner axle sleeve/C-gussets/lower control arm skids, River Raider Breather Hose Extension Kit