The Meillerwagen (English: Meiller vehicle) was a German World War II trailer used to transport a V-2 rocket from the 'transloading point'[1][a] of the Technical Troop Area to the launching point, to erect the missile on the Brennstand (English: firing stand),[b] and to act as the service gantry for fuelling and launch preparation.

The unofficial 'Meillerwagen'[c] name was often used in official documents and refers to a parts supplier for the trailer, Meiller-Kipper GmbH of Munich, Germany (founded 1850).

After the Meillerwagen was close to the launch point, the Firing Platoon Truck Section took charge and removed the rocket's camouflage cover and rudder protection.

The control compartment batteries, alcohol-filling connection, tools, and other equipment were loaded into a box on a strut at the top of the Meillerwagen's lift frame.

A steerable front truck was installed just behind the trunnion box member, while the turntable surmounted a two-axle rear bogie.

The duplex wheels rode on swinging wishbone axles with transverse semi-elliptical leaf spring suspension.

A turntable at the rear of the chassis frame supported a bogie, mounted on bearings so it could swivel and pivot.

Each front corner of the chassis was fitted with a swing-out A-frame boom equipped with a screw jack and foot plate.

The system included four sockets at the upper and at the lower end of the lifting frame, and the connective wiring fixed along the starboard beam.

The drive motor was a petrol KdF (Volkswagen) 14 ps (hp) engine, adapted for stationary industrial use by the fitting of magneto ignition and a centrifugal governor to the throttle; besides these modifications, the engine was otherwise identical to those found in Volkswagen Beetles, an air-cooled flat-four boxer.

(Meillerwagen at Operation Backfire were fitted with electric motors as hydraulic drive in place of the petrol engine.)

The largest extending cylinder included a flange halfway along its length, against which hydraulic pressure could be selectively applied from either above or below; it was used during raising to delay its extension until all other cylinders had extended, and also to begin the lowering process when the lifting frame was vertical (once lowering had thus been initiated, gravity finished the job).

Acting as gantry, the lifting frame included a number of work platforms from which crewmen serviced the rocket.

The port beam of the lifting frame was fitted with around 40 rungs along its full length, with which crewmen climbed to the working platforms.

The bell crank turned a transverse shaft fitted with an eccentric cam, which would push or pull the pivot clamp, thus moving the rocket forward or aftward along its centreline.

A shift lever at the nose clamp disengaged the drive shaft to allow either simultaneous or independent operation of the two worm gears.

The worm gear at the pivot clamp operated a pair of scissor arms, one on each side of the lifting frame to insert or extract the trunnion pins from the rocket.

A toolbox fixed on the chassis carried snow chains, a tyre pump, and assorted tools for the Meillerwagen and KdF motor.

The chassis was equipped with a pair of blast shields, entrenching tools, a hand-steering A-frame, two jacks, a spare tyre and a folding ladder.

Special trays were fixed on the chassis to carry the transport cases which held various rocket accessories such as the graphite steering vanes, the nose fuse, and the Z-Stoff (permanganate) flask.