ROOF RACK vs CROSS BAR？
3 things you need to consider before purchasing.
1, Weight capacity: most of Roofrack and Heavy Duty Cross bars are good with carry a hard shell RTT.
2, Space: Is there a 1.5-inch installation space for easy installation of tents? All cross bars have good space for moutning and tie down the tent, some of Roof rack are so hard to get hand underneath, you have to deal with it all the time.
3, Cost: A pair of 60 inch heavy duty cross bars range from $270 to $539. a roof rack is from $800 to 1600, not including RTT riser, some might vibrate during driving.
2 things crossbar users need to be careful.
A, Crossbar need to be firmly attached to the side rails or car roof, it is the KEY, C clamp is not safe enough.
B, check the below attached, choose the right crossbars.