4 bike hitch rack = guaranteed scratched bikes . I use a Thule Apex w/ 4 bikes. 4 bikes are so close together on the rack that the bikes hit each other: the bikes sway, the handlebars turn, some times the carrier the bike sits on slides toward other bikes. Also it's difficult to load 4 bikes trying to figure out where all the pedals should go where they don't hit the bikes. Sometimes, I'll load a bike and a pedal hits a frame.