Radian 3QXT › fit in › Ram 1500 Quad Cab

Will the Diono Radian 3QXT fit in a 2019–2024 Ram 1500 Quad Cab?

Yes — the Diono Radian 3QXT fits a 2019–2024 Ram 1500 Quad Cab, with a caveat.
The Radian 3QXT is about 17" wide; the 1500 Quad Cab's usable rear bench is about 50". It fits one rear position comfortably. Three across is tight (51" needed vs 50"). Note: rear legroom here is limited, so a rear-facing install may crowd the front passenger.

17"Radian 3QXT width

50"1500 Quad Cab rear bench

Tightthree across

★★★☆☆NHTSA Ease-of-Use

Check the Radian 3QXT on Amazon → All seats for a 1500 Quad Cab

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What fits this 1500 Quad Cab

One seat, rear position: Yes. The Radian 3QXT installs in an outboard rear position of a 2019–2024 Ram 1500 Quad Cab, though you may slide the front seat forward for rear-facing.
Three across: Tight — three need ~51" against only ~50". A narrower seat is the better bet.
Modes this seat covers: rear-facing → forward-facing → booster.
LATCH: lower anchors up to 40 lb; the 1500 Quad Cab has 2 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 3QXT's width (Diono published spec (17 in)) and the 1500 Quad Cab's rear-bench width (Typical for pickup — extended cab — approximate, verify install in your vehicle) are both approximate — confirm with a test-fit before buying.

Common questions

Will the Diono Radian 3QXT fit in a 2019–2024 Ram 1500 Quad Cab?

Yes — the Diono Radian 3QXT (17" wide) fits a single rear seating position in a 2019–2024 Ram 1500 Quad Cab. Because this vehicle has limited rear legroom, a rear-facing install may require sliding the front seat forward. Three across is tight — its rear bench is about 50" and three of these would need 51".

Can you fit three Radian 3QXTs across a 1500 Quad Cab?

Probably not — three Radian 3QXTs need about 51" but the 1500 Quad Cab's usable bench is only about 50". Consider a narrower seat — see our narrowest-seats guide.

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.