Most baskets bolt to the stock rails so they aren't any stronger. After years of wheeling with the spare on the roof I pulled out some of the nut serts.
I had Thule rails on my old XJ that clamped onto the rain gutter. They held up well but would slide back on the rails when going thru heavy brush/branches. Two self tapping screws in each foot solved that problem. They even survived the roll over and got transferred to my Dad's XJ.