Link to AU product page: #41102 - Pioneer Tray (1800mm x 1140mm) | - https://www.rhinorack.com/en-au/products/roof/roof-trays/pioneer-trays/pioneer-tray-1800mm-x-1140mm-_41102
Rhino-Rack Pioneer Tray - welded-rail unobtainium. Same as Rhino-Rack Pioneer platform but with rails.
Purchased new in the box for an 80 series, but it's too narrow by a couple inches to use with Rhino-Rack's Vortex rain gutter legs.
The measurements in the link are for inside rail to inside rail, side to side and front to back. The mounting surface (bottom of rack) is 76"x49.5" You can of course use the other leg mount systems for your rig.
It has been removed from the box, but not mounted. This thing is a beast. Liked it so much ended up buying the same, right-sized rack for my 80.
Excellent brand-new shape.
Local PU only.
It is leaning up against my living room wall at the moment so ask questions and I'll do my best to answer.
I got a good deal so passing the savings on.