What we researched for this specific generation: where an enclosure actually fits, what the factory speakers are, how the factory audio is wired, and which real builds and commercial products exist for it. Confidence badges say how well each figure is sourced — this is research, not manufacturer spec.
Body styles covered: 4-Door Subcompact Crossover
These are researched envelopes, not a guarantee. Measure your own vehicle — the numbers here tell you what to expect, not what you have.
| Location | cargo area behind the rear seat |
|---|---|
| Outer bounding box | No maker-published or independently measured cargo dimensions found (width between wheel housings, floor length, height, opening, liftover all absent from every maker document read). |
| Known obstructions | Order guide row "D7X Cargo storage, tray under rear floor" is standard on every 2018 and 2019 trim, and "Tire, compact spare" is standard; the spare's position is not stated in the Trax guide. |
Sizes and depths below are what research turned up for this generation. Confirm against your own vehicle before cutting or ordering — trim levels vary.
| Factory speaker size | GM's order guides give speaker counts, not sizes or positions |
|---|---|
| Adapter bracket needed | unconfirmed |
| Factory speaker size | same gap as the front doors |
|---|---|
| Adapter bracket needed | unconfirmed |
| Factory amp / premium audio | GM order guides. 2018 (published June 2, 2017) and 2019 (published May 4, 2018): "UQ3 Audio system feature, 6-speaker system" standard on LS and LT, not available (--) on Premier; "UQA Audio system feature, Bose premium 7-speaker system with amplifier, including subwoofer" available (A, only with the Sun and Sound Package) on LT FWD and LT AWD, standard on Premier FWD and AWD, not available on LS. No wattage, speaker sizes or positions, and no subwoofer location. |
|---|---|
| Adding subs without a head-unit swap | no vehicle-specific integration information found |
GM order guides (SPECS page, Capacities): "Cargo volume, with rear seat up, cu. ft." 18.7 (529.6 L) and "with rear seat folded" 48.4 (1,370.7 L) for every 2018 and 2019 trim (LS, LT, Premier; FWD and AWD). Unlabelled US cubic feet from a GM dealer document. A luggage rating, not a box dimension. The guides carry no cargo width, length, height or opening; "D7X Cargo storage, tray under rear floor" is standard on all trims and a compact spare is listed. Years 2015-2017 and 2020-2022 were not read. No box made for a 2015-2022 Trax was found from the box makers checked. Measure your own cargo area before cutting wood.
Each link opens the tool with this vehicle already selected.
Measure your own vehicle. Trim levels, factory subwoofer options, and mid-generation changes all move these numbers, and a box cut to a researched figure that does not match your truck is wasted wood. Where a badge reads Unconfirmed, treat the value as a starting point for your own measurement, not as an answer.