Impressive work.
I'm also impressed with what toyota did with insulation stockwise, at least on the 01-02 limiteds except the front cup holders (get warm). I've rented several newer vehicles some of which were incredibly noisy and transmitted lots of road noise and of course they all have highway tires on.
For those who do want to insulate further, I've used this on quads, underhoods and here and there under rear seats to insulate from exhaust heat. It's peal and stick,measure, cut and stick, easy peasy.
Heat Shield Insulation Sound Deadener For Auto Vehicle Hood Trunk 90"x39"x3/8" | eBay
Luck and enjoy the Runner.
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2001 Limited 4WD - 346+K - SunfireRed\Thunder Cloud; - 265/75/16 Michelin A/T2s - Fat Pat's 1.5" BL - StopTech ANGLED rotors - In series 699 trans cooler, New Yota1 transmission, All new OEM suspension front to rear.