The trailer was never Optimus Prime. He transformed and it did not: it detached, dropped its legs, swung its side open and turned into a room with a ramp, and Roller drove out of the back of it. Toys have mostly treated that room as the box the figure arrives with. Robosen’s version has the motors in it.

The Elite Optimus Prime Trailer Kit reads In Stock at BigBadToyStore this morning at $1,199.99, with a live Add to Cart and schema.org/InStock on the listing [1]. Robosen’s own store carries it at $1,199.00 and also reads available, read first hand in US dollars [2]. Robosen’s product bullets put the run at 2,500 units and call it a North America exclusive, and an edition size on a piece at this money is the nearest thing to a deadline a buyer gets.

The Robosen Optimus Prime Trailer Kit laid out on white: the silver and white trailer with blue stripes and a red Autobot sigil on its flank, two metal ramp plates, two white support cradles, a grey pad, a small black connector block, a white USB-C cable, a black power adapter, the Roller scout car with a Spike figure beside it, and a black display base with the Autobot sigil embossed into it.

What it does is convert itself. Robosen lists three modes and describes a three-way auto-converting trailer system rather than a fold-out one, though it cannot decide what to call them: the product bullets say Transport, Command Base and Battle Deck while the spec panel underneath them labels the same three Trailer, Command Deck and Battle Base [3]. The bullets put Roller, Spike and what Robosen calls tactical turret support inside the kit, and say one app controls Optimus Prime, the trailer and Roller together. Robosen’s own photography backs the parts list up: Roller is on the ramp with Spike standing on its roof, the ramp is lit, and the turret is up on a black arm above the open trailer.

The same panel counts what is inside: 18 servo motors, 53 microchips and more than 2,000 components. Eighteen servos is a lot of things to go wrong.

Robosen’s Elite Optimus Prime has been on that store since October 2022 and converts itself between robot and truck [4]. An accessory that opens by itself would be a nice trick on its own, but dock this one to the figure and both halves of the 1984 design run off the same app and take instructions as one machine. The 1984 trailer and the Masterpiece trailer both need your hands.

The trailer standing open on its end in Command Base mode, its two silver interior walls spread wide and crowded with moulded machinery, with a turret on a black arm rising above it. The Elite Optimus Prime figure stands in front of the opening in red and blue, and the silver Roller scout car sits at his feet. Robosen's caption reads, Elite Optimus Prime not included.

The money, then. The trailer is $1,199.00 and the Elite Optimus Prime figure it docks to is $999.00, both listed and both available at Robosen today, which comes to $2,198.00 for the pair bought one at a time. Robosen also sells them together as an Elite Optimus Prime & Trailer Kit Set at $1,599.00, capped at 300 sets [5], so the set saves $599.00 over doing it in two goes. A two-year extended warranty on the trailer sits on the store as its own $69.00 line item.

Then there is the case. Best thing in Robosen’s whole gallery! The trailer does not arrive in a printed window box; it arrives in a grey hard case with the foam cut to the shape of every part, ramps, connector blocks and cables each in their own recess, of the kind a camera body travels in.

The Trailer Kit packed in an open grey hard case with cut foam. The lower half holds the assembled trailer, the Roller scout car, two grey ramp plates and several black connector parts, each in its own recess. The upper half is a moulded foam tray with empty cutouts for the remaining pieces.

Robosen’s product page went up on 7 May 2026 [4], and ToyHypeUSA flagged the kit as available on Sunday evening. Both stores back that up this morning: stock rather than a preorder, no arrival estimate to wait out, and a 2,500 unit cap sitting under it. The 1984 trailer had no motors in it. This one does.

[1] BigBadToyStore product 188776, variation 370105, read 21 September at 8:45 in the morning Eastern: $1,199.99, schema.org/InStock, Add to Cart live, and no arrival estimate printed on the listing.

[2] Worth knowing before you argue with anybody about the price. Robosen’s US store will answer in Canadian dollars depending on where it thinks you are, and it returns $1,762.53 for this trailer when it does. Check which currency is on the page before you take a figure off it.

[3] Robosen splits on the edition size too, on the same page. The bullet says “Limited to 2,500 Units - North America Exclusive”; the spec panel says “North America Exclusive Edition” and then “Limited to 2,500 Units Worldwide”. Whether 2,500 is the world total or the North American allocation is not something Robosen has settled in its own copy.

[4] Both of those are the publish dates on Robosen’s own store listings, for the figure and for the trailer.

[5] Robosen’s bullets for the set call it a “Limited 300-Set Collector Edition” and list Optimus Prime, the three-mode trailer, Roller and Spike under one app. That page went up on 30 July 2026.

Sources: Robosen Elite Optimus Prime Trailer Kit and Elite Optimus Prime & Trailer Kit Set, Robosen’s own store, prices and listing dates read there on 21 September. Stock and price at BigBadToyStore, read the same morning. Availability flagged by ToyHypeUSA, 20 September. Product photography: Robosen.

More Prime on the site: Robosen at the Hasbro SDCC 2026 panel, and the Hot Wheels x Transformers Bumblebee that opened on Mattel Creations on 17 September.