Putting the Hold Up together and getting it on the car took about 20 minutes and was straight forward. The point is that rear end sagging from a bike rack shouldn't be an issue. That'd have to be some seriously weak rear springs to sag under the weight of a rack and a couple bikes. Trust me when I say the ability to load any size bike is a huge, huge bonus. We are looking for a good rack, I am thinking of getting a hitch and putting it on, and then getting a hitch bike carrier.
I drove from Ohio to California and back with my Holdup loaded, with no issues.
Review: Yakima Hold Up Hitch Mount Bike Rack
With the rack on, in any position, the small section of my tailgate that comes down would not clear. Pretty basic physics dude. I have T2, rear hitch rack and very happy with it. I had the black cable attached to the hitch receiver which stopped me from dragging the outside bike on the ground. It has a red flag that sits behind the rear bike to alert motorists that this thing sticks out pretty far from the rear of the car see below for parts list. I think the rack weighs about 17 pounds. The mast in the middle is shared between the 2 trays so when it's time to use it, you have to kind of roll the bike into the rack from the side, when you really just want to be able to lift it in.