I bought my WT from stock, abandoned order and it had the capable bumper. I ended up getting a Chinese eBay mod bumper, I think I bought one of the first ones, paid $625 shipped and it's been a pretty good deal, holding up well after a year.
I have the Ford slide out shelf and other than it's a slide out shelf they are completely different. I'll venture to say the Ford shelf is better made and looks to be a bigger but it's twice the price. If you order one when you order your Bronco they are only $600. Love mine.