Any input would be great. We would not get one for a little while, since our dog cannot get up into a RTT; just trying to get some facts. .
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Quite a few threads here on the same subject but here's my $.00002
We've owned and extensively used two different RTTs: Autohome Overland XL and a Maggiolina Grand Tour (Med)
The big advantages of an RTT:
*Never lumpy as a ground tent can sometimes be
*Super fast to deploy and be sleeping
*Super fast to collapse and be driving
*Bedding doesn't take up interior space within the vehicle
*Very comfortable and secure
*Hard shell (ala Columbus and Maggiolina) are much more secure in windy areas.
*A bit harder for vermin to enter the tent...a factor during hot climate stays in snake prone areas
The big disadvantages of an RTT:
*Cost; aerodynamics/mpg hit (for brick like RTT shapes)
*Dealing with the cover for non-hard shell RTTs can be a PITA high atop a 4x4 rig and/or when the wind's blowing
*where to store it during the months you aren't using it (assuming you don't want to leave it on said vehicle); bulky and heavy to manually remove and lift back on to the rig (without some type of lift assistance...like a fork lift or ceiling winch system I've designed!)
*puts weight in the worst place on the rig: High!; typically weighs nearly 200lbs when everything related to the RTT is factored (additional roof bar supports, bedding).
*Not as much room for duffle bags, etc. especially in the Maggiolina variety.
*Dealing with the ladder (more of an issue after several cocktails and/or pee breaks in the middle of the night).
*Non Maggiolina RTT types can be darn noisy, from the non-tensioned fabric, flapping in windy conditions

Did you read the snippet I had posted in my blog from Autohome?Sorry, maybe I wasn't clear. I'm not looking for reviews/opinions of different brands, I'm trying to decide if a RTT has any real advantages over over a conventional tent on the ground.
I too used a wide variety of ground tents in my earlier days of car camping and back packing.What advantage is there to having my tent on the roof of my vehicle?
The primary benefits in getting your tent up off the ground are…
Your shelter is always with you and ready for a comfortable night’s sleep, which gives you a great deal of freedom
Moving your sleeping quarters to the roof means that you have much more space in your vehicle, and no need to unpack to set up a comfortable place to sleep
You don’t need a place to pitch your tent – so you can ‘camp’ anywhere – even RV parks that do not allow traditional tent camping.
Fast and easy setup, even in the dark, equally fast and easy take down in the morning, even when the weather is wet and cold.
Your vehicle stays cooler because the roof is shaded by the tent.
Your tent also provides ready storage of your bedding and some equipment.
AutoHome tents offer great ventilation and good view
Fewer worries about insects, snakes, wildlife and other things that go bump in the night.
Your tent – being up off the ground, will collect much less sand and dirt to contend with
Sleeping on rocks or puddles is a thing of the past. Now you can camp anywhere your vehicle takes you – just park, pop open your tent, and get comfortable
The list goes on, and you are only limited by your imagination.