DOES THE YAKIMA HOLD-UP PLUS 2 ADD-ON FOLD...
DOES THE YAKIMA HOLD-UP PLUS 2 ADD-ON FOLD UP WHEN NOT IN USE AND IS IT MADE OF ALUMINUM? DOES THE BOTTOM RAIL SEPARATE IN THE MIDDLE SO ONLY TWO BIKES CAN BE CARRIED?
It's made of steel and plastic. It does fold up when not in use. I'm not sure what you mean by "DOES THE BOTTOM RAIL SEPARATE IN THE MIDDLE," but it is possible to use this to carry only two bikes and leave the other two spots empty. It's important to note that this won't do you any good on its own. You have to have a 2in. Yakima Hold-Up Bike Rack (YAK0289) for this add-on to be of any use to you.