I was in the same boat. Spent about 4 months reading everything I could about the frontrunner, rhino, and some other options.
My biggest concerns were wind noise, sunroof access, as low pro as possible, and comfortable for the kids to sit on.
I'm surprised to see so many people on here saying they have no wind noise with the FR. I read so many reviews that complained about the excessive wind noise of the FR with some people even going so far as to get rid of it for that reason. While I didnt test this in a lab physics seems to be at play here. 1) the rhino rack has a curved leading edge as opposed to square block. 2) Slats run in line with the vehicle as opposed to running perpendicular to the vehicle (FR), chopping through wind instead of going with it.
I ended up purchasing the RR 76x49 with backbone and just got it installed last weekend. Road noise is there but minimal. I think most of what i hear is from the side mount ski rack.
Best I could tell nothing else matched the load bearing capacity of the RR with backbone. 220lbs driving, 700lbs static. Thats what I would want if im putting a RTT up there. Which I personally wont be. But my big ass can get up there with the kid and a couple of lawn chairs, cooler etc and not sweat it.
RR seems to have good accessory support and I've purchased a few including the side mount maxxtraxx holder, a 2 ski/4 fishing rod holder (mounted on the side to the maxxtraxx holder), and an eye bolt kit.
Also, the gentleman that talked about the mounting bolts interfering with the channels for mounting accessories is completely inaccurate, at least when using the backbone system. There are 5 crossbars that bolt to the bottom of the platform and run from side to side. 3 of these bars are used to attach the platform to the backbone system via a "t bolt" that turns and locks into the channel of those bars. The channels for mounting accesories are completely separate and are on the aluminum planks that run the length of the car. There is absolutely no interaction between the two.
RR was slightly less $.
I think the backbones look better than the FR option.
I put the FR to the back of the list fairly quickly due to wind noise concerns. I either missed it because of that, or they werent out at the time, but I didnt see the feet option (just noticed them while looking for load bearing which btw is 660lbs static with their feet). If I had, I may have said damn the wind noise and gone that option since their 3/4 option doesnt cover the sunroof at all. With RR the shortest you can go with the backbones is the 76 which covers half to 3/4 of the sunroof
Either way, I'm sure you will be happy, you're driving a 4runner
