Looking at 2017-18 4Runners. It seems that the roof rails are standard equipment but not the cross bars. The dealers want to sell a 'wilderness package' that is basically all weather mats and cross bars for a ridiculous add-on price. I've seen 4Runner cross bars on sale for $100 on the internet. Anyone who has experience with installing cross bars. Should I just go with the standard rails and buy my own crossbars or am I missing something. Thanks