If you check out
http://www.thuleracks.com/carrier_luggage1.asp
There is a feature that you can actually pick the liberty and place different boxes on it to see how it looks. I have the LB50 Thule load bars and foot pack to attach to the factory roof rails and it works great. I also have used the Thule # 602 - Ascent 1100 roof box for the last 3 years, and have never had a problem.
I must "pitch" the Thule product as I have used and sold them @ a local bike shop for over 10 years and have never had a problem. Great warranty, made in Sweden, and based out of Chicago. Overall great company to deal with.
With the 50" load bars I can fit this box, and 2 bikes on both sides with the box centerd. 4 bikes total. I can send you pics with the set up if you like, just PM me.
The box itself takes less than 5 minutes to install and even less to remove. I have never had a problem with leaking or any parts breaking from use or the cold up here in Wisconsin land. NO TOOLS REQUIRED FOR THE INSTALL. ONLY HANDS AND FINGERS!!!
MPG wise, expect to lose @ least 2-5 mpg with the box or bikes on the roof. If you install a fairing on the front of the rack you will cut down on the "howling" noise that most roof racks make considerably. I do not notice any other extra noise with the box on.
I will try and post the pics, but I am not good with the kind of thing.....
