Thanks for all the info guys, I spoke with a Rhino Rack rep and he explained the following:
The photos you sent are a custom install of our Hilux track with track legs and discontinued silver Pioneer Platform, now only available in black. In Australia the Tacoma is called the Hilux and we have a custom track for this car. We do not have a custom track for the USA Tacoma as they are slightly different. The Hilux track can be retrofitted to the USA Tacoma with some modification and some of our rack specialty stores have knowledge of how to do this. It depends where you are located in the US. Let me know your location and I can see if any store with this know-how is in your area.
We cannot tell by the photo if this is an Australian Hilux or US Tacoma. Again, Outback Proven was Aussie owned so it could be an original Hilux - difficult to tell from the photos.
The sizing of the tray depends how far apart the rain-gutters are the Hilux tracks are installed into. We'd need you to take this measurement to determine what Pioneer may fit.
We hope this helps your inquiry. Feel free to let me know your location and we can check if any rack specialty stores in your area are familiar with this very rare, highly custom install.
//////
Thanks for your reply. Our engineering team is working on several new applications for the US Tacoma already including possibly a custom track, as we are aware of the factory mounting points in the roofline. However a timeline on release for any of the new systems is not available.
If you’d like to move forward with a custom install of the Hilux track I can provide you the part number of the tracks, and you would have to order them from us directly which I can do you for you.
Again, this is a custom & modified install recommended to only be done by an authorized Rhino-Rack specialty rack vendor. We do not warranty this fit as it’s a modification of an Australian fit to a US vehicle, and all installs for this are at the customer’s sole discretion.