I just put on a yakima megawarrior (52 x 48) on my 92 4Runner and it fits great for me - runs from the back (about 4 inches from the hatch when open), to about right past the drivers door - they make an extension, which will make it 74 x 48 and I can't imagine something larger than that on my 4Runner - maybe measure 74" and see how much it covers - the 48" just barely sticks out over the roof, but it looks pretty cool - remember the load limit of the roof rack, so the bigger the rack, the more stuff you might to put in it, but can't due to weight - just a though