I also have thought of getting a roof rack for my car, but I am not a fan of aftermarket clamp on roof racks. Plus if one of my kids, or me not thinking, opened the sunroof, it would not be good!
Who make a roof rack that would work on the malibu, and accommodate a 10 foot Jon boat?
And as far as the radiator, I could see the fan kicking on and the boat going bye bye, those fans move alot if air and the boat would be a huge sail!
2012 Coachman Sportscoach 405 FK2012 Chevrolet Malibu LTZ w/2LZ - Dinghy