I like the ARB Simpson III. It unfolds easy and gets put away quick. It is a bit longer than the sleeping bag so you can put your boots down near the end and a small bag. I also has the little extra cover area so people cant see right into the tent.
And yes Mike, I install it myself. I pull into the garage, lower it down, bolt it on and go
Course I have tall garage doors that allow me to clear it with the tent installed
The lift mechanism is $150 with free shippinghttp://www.amazon.com/exec/obidos/AS...=nosim/ihco-20
The ARB Simpson was very comfortable on the Maze trip. I used nakmans full rack and also had two forerrunner two natao gas can carriers mounted on the back. Used on for gas and the other for a propane tank for the propane fire (no wood fires allowed)
Kurt from cruiseroutfitters has a great review of them