Here is a little more info on the bike rack itself. I bought a Thule T2 "2 Bike Add-On" (918XTR) which is designed to extend the standard Thule T2 bike rack from 2 to 4 bikes. It is cheaper than the main rack by over $100. I just discarded the main tube the extension came with and used a 2" piece of square tube instead. This allows me custom length and eliminated all joints. There is a built in retracting cable for locking the bikes to the rack.
I am still deciding whether or not to add another bike platform or two, and whether or not to raise the platforms. I really like being able to easily load the bikes from the ground.
'04 GMC Sierra 2500HD, CCSB, D/A, MaxBrake, B&W Companion, Retrax Pro, AR Power Steps
2013 Rockwood 8289WS w/Diamond pkg
1969 Camaro RS/SS Convertible
Dad's old 1968 Empi Imp (recently recovered from under 21 years worth of boxes/dust)