Check with Paul at Equipt Expedition Outfitters. He is piecing together a Front Runner rack for my 4Runner using components from other vehicles. I think the GX is also a possibility for a custom fit. We will be doing the test fit In two weeks. The Front Runner rack is a great product and there are several accessories available for it, so you can configure it as needed. I'll be running a 1400 RTT and some misc gear...room permitting.
TOTAL CHAOS FABRICATION - EQUIPT EXPEDITION OUTFITTERS - KING SHOCKS - SHROCKWORKS 4X4 PRODUCTS - BUDBUILT - GOODYEAR - PIAA - PERMA-COOL - WARN - AMSTEEL BLUE - COBRA