Occasionally I carry three bikes on mine. I have three Yakima King Cobra bike carriers mounted on Yakima cross bars - don't recall what model cross bar, but here are some pics. BTW, Yakima now has a better lighter version of the King Cobra:



I think you'll really like the King Cobra (or whatever it's latest rendition is called). Mount the bikes with front tires facing rear of truck if you want slighter better mileage and slightly less noise. I also purchased the foamy thingy that wraps around the bar - it really dampens out bar vibes when less than two bikes are mounted.moving People and 4 bikes is the problem. I am doing that today when i go out by my self. remove the front wheel and the bike will fit in the SUV without any issue. When comes to 2 kids, 2 adult bikes Plus 4 people. No way that i can fit without using external rack.
JM
Don't recall P/N but if you go to Yakima's web site, you will be able to configure for the ML - they have newer better hardware than what I purchased years ago. You'll need the cross bar (x2) along with the cross bar attachments (x4) to the ML's roof rack. After years of experimenting, I have found that these bars are least noisy when placed as far apart as possible. For me, the fronts are as far front to still allow the moon-roof to flip open, and as far back as where the mid-section of the rack joins the rear section (basically a few inches ahead of the GPS antennae). Also, get the cross-bar pads - they help tremendously in dampening the bar vibration when unloaded. I did buy a couple spare rattler straps, just in case.What is the part number for the horizontal rails and the rest of the bits?