Radian 3QX › fit in › Toyota Tacoma Double Cab

Will the Diono Radian 3QX fit in a 2016–2024 Toyota Tacoma Double Cab?

Yes — the Diono Radian 3QX fits a 2016–2024 Toyota Tacoma Double Cab, with a caveat.
The Radian 3QX is about 17" wide; the Tacoma Double Cab's usable rear bench is about 52". It fits one rear position comfortably. Three even fit across the back (51" needed vs 52"). Note: rear legroom here is limited, so a rear-facing install may crowd the front passenger.

17"Radian 3QX width

52"Tacoma Double Cab rear bench

Yesthree across

★★★☆☆NHTSA Ease-of-Use

Check the Radian 3QX on Amazon → All seats for a Tacoma Double Cab

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What fits this Tacoma Double Cab

One seat, rear position: Yes. The Radian 3QX installs in an outboard rear position of a 2016–2024 Toyota Tacoma Double Cab, though you may slide the front seat forward for rear-facing.
Three across: Yes — three need ~51" against a ~52" bench. Test-fit; three-across is decided by half-inches.
Modes this seat covers: rear-facing → forward-facing → booster.
LATCH: lower anchors up to 40 lb; the Tacoma Double Cab has 3 lower-anchor positions.

ℹ️ Informational only — built from NHTSA public car-seat ratings and published seat/vehicle dimensions. This is not a safety certification and not a substitute for the seat and vehicle manuals. Always confirm the fit and install yourself before every trip. The Radian 3QX's width (Diono published spec (steel-framed, 17 in)) and the Tacoma Double Cab's rear-bench width (Toyota dimensions + owner measurements (approx); midsize crew cab, upright rear) are both approximate — confirm with a test-fit before buying.

Common questions

Will the Diono Radian 3QX fit in a 2016–2024 Toyota Tacoma Double Cab?

Yes — the Diono Radian 3QX (17" wide) fits a single rear seating position in a 2016–2024 Toyota Tacoma Double Cab. Because this vehicle has limited rear legroom, a rear-facing install may require sliding the front seat forward. Three of them also fit across its roughly 52" rear bench.

Can you fit three Radian 3QXs across a Tacoma Double Cab?

Yes — three Radian 3QXs need about 51" and the Tacoma Double Cab's usable bench is about 52". It's close, so test-fit before buying.

Sources: seat ratings & modes — NHTSA (pulled 2026-06-18); dimensions — manufacturer specs and owner measurements. Informational only — built from NHTSA public car-seat ratings and published seat/vehicle dimensions. This is not a safety certification and not a substitute for the seat and vehicle manuals. Always confirm the fit and install yourself before every trip.