Mm˛® "Expandable Rooms to Go" products

   Overview (see more photos and watch a video, below)

The Mm˛® Expandable Rooms to Go housing solution provides durable and highly portable shelter for a wide range of interim needs.  Applications include portable office usage, vending kiosk, medical or emergency shelter applications.  The Mm˛® units fully expand in less than three minutes, to three times their original volume; a goal not previously attained by any durable materials solution (versus tents or soft materials.  The Mm˛® is mounted on a 17' two-axle chassis, which can be pulled with almost any small truck or van.  We have tested this technology to be pulled by common truck models; including the Toyota Tundra and Ford 350.

Mm˛® interior space is flexible and can be easily divided  into one, two, three, or four individual rooms.  A standard model provides 275 sq. feet of space.  A larger capacity version provides up to 800 sq. feet of living and working space.  A ten-year effort has been invested in the design, testing, patenting and marketing of this unique product; including thorough road testing in the challenging terrain of Baja California, Mexico.

The Mm˛® Expandable Rooms To Go units are highly flexible; and can be outfitted for use as mobile health clinics, portable dressing rooms, interim office space, food service, trade exposition usage, control centers, disaster relief shelters, and more.  Such varied uses do not require basic design changes, but only slight modifications to the chassis.  The basic, yet flexible design allows units to be marketed in different industries as shells; with the specific use tailored to meet industry or individual requirements.

MmFeatures and Benefits for Expanded Space needs

For Slide-outs or Expanding Rooms - mounted on trailer or truck frames - Morrow mobiles˛ Inc. can offer your company the technologies needed to increase usable square footage and volume.  Why have fixed widths or height, when both dimensions can be changed at the same time, quickly, while maintaining level floors?

Level Floors

When rooms slide out, the floors of these rooms should be in the same horizontal plane as that of the interior main body floor.  This prevents step ups, improves seals, and lessens manufacturer liabilities.
Positive Environmental Seals When your expanding rooms slide in and out, or if the rooms and main body raise or lower vertically, your customers deserve complete protection from water, dust, insects, and other intrusive elements.
Easy to use Support Jacks When rooms slide out, what is the mechanism used to provide support, beneath the extended rooms?  With the Mm˛, the user simply adjusts the support jacks, from inside the rooms.  There is no need to crawl under vehicles!
Levered-Over-Center Walls If your product utilizes vertical expansion, how do the upper and lower halves of the end and side walls become vertically aligned, for continuity and rigidity?  With the simple flip of a lever, your customers can easily make one strong vertical wall from two separate halves, using the Mm˛® technology.
Low Towing Profile If your product does not expand or contract vertically, your customers face increased fuel costs and greater exposure to damage, resulting from crosswinds and dynamic instability (caused by a high center of gravity).  With its low profile in the closed position, the Mm˛ will help you to cut costs and increase safety, creating more satisfied customers.
Interior Headroom Greater Than Exterior Closed Size When using vertically-expanding products, your customers should enjoy over 7 feet of interior headroom.  Can your company deliver this feature from a product measuring less than 7 feet from ground to the top of roof, when closed?   You can now!


Click on the photo at left to watch a ten-minute video of our Mm in action!  This video features an Mm2 with four separate rooms.  Our newest model features a common area which can be divided, and a simplified hydraulic and hand-crank expansion (reducing unit weight and power requirements). For those with lower speed internet connections, please click here to watch this video.

Additional Mm˛® Questions and Answers

  • How do the Mm2 units open and close?

The rooms slide out of the main body and lock onto the upper edge of the roof; the roof is then raised, pulling up the extended rooms.

Click the image, below, to watch wire-frame version of the Mm˛ unit expansion process...

  • How does the Mm2 form a single unit, once open?

The extended rooms have two parts; a lower and an upper half.  The upper extended room fits over the lower one, when the unit is closed or the roof is lowered.  As the unit is opened, the upper extended room - locked onto the roof - is vertically pulled over the lower room.  The lower extended room doesn't move during this procedure.   Once the roof is fully raised, the lower and upper room edges seal together. 

Click the image, below, to watch another image of Mm˛ unit expansion...

  • What supports the roof and rooms, once expanded?

The unique levered-over-center end walls snap into place and - along with the four corner posts - form a strong vertical unit, which easily supports the weight of the roof and rooms.  A steel roof truss provides extra strength and lifting capability, at the point where the rooms attach to the roof.

  • When the rooms are extended, do I need to step up to enter a room?

No, we have developed a technology which creates a single, flat floor, once the rooms are extended.  When closed, the extended floors rest on the main floor.  Opened, the floors of the extended rooms become aligned on the same plane.  We are not aware of any other extended room vehicles, with this feature.

  • Is unit expansion a manual or powered action?

For most applications, Mm2 expansion and contraction is powered by a hydraulic system, running on standard 12V DC current (same as car batteries).  The rooms and roof are kept from binding by use of a cabling system, which keeps them straight and aligned.  If a loss of electrical power is experienced, disabling the hydraulic system, then the manual override system may be used to expand and contract the unit.

  • Can other electrical power sources be used?

In addition to the 12V DC system used for the hydraulic motor (also: for ceiling and exterior porch lights), when plugged into a normal AC system, Mm2 units provide AC power through GFI-protected outlets.  Whenever connected to an AC source, the Mm2's converter delivers 12V DC power to the lights, while charging the onboard battery system.  Understanding that power specifications differ from country to country, we are happy to install any  customized electrical components, to meet your specs.  Just specify voltage, amperage, and receptacle design required.  Our standard configuration is 110-120V AC, 30 amps, with separate 20 amp breakers on each circuit.

  • What materials are used in the manufacture of an Mm2?

Room frames are made of lightweight, tubular steel.  Unit end-walls and roofs are filled with insulating foam and covered with durable fiberglass skins (inside and out).  This combination not only lends strength and beauty, but also provides R-factor insulation values of over 19 (roof) and 12 (walls).  Floors are composed of Nida-Core® polyethylene hexagonal panels, laminated with luann plywood.  This makes the floors exceptionally strong, yet extremely lightweight.

  • What are the Mm2 braking safety features?

The Mm2 has electric brakes mounted on all four wheels, controlled by a sending unit in the tow vehicle.  A resistor helps to ensure safe and even stops.  The unit also has a breakaway switch, powered by a battery attached to the braking system.

  •  What are the vehicle requirements to tow an Mm2 unit?

A minimum 3/4-ton chassis rating is required, with a 1-ton rating recommended.  The tow vehicle should also have a brake sending unit with a standard six-pin connector (to activate  brakes; power running, stop and turn signals; and trickle-charge the Mm2 battery).  The Mm2 comes with a two-inch ball coupler, which can be switched to a different type, such as a pintle-hook connector, if requested.

  • Why are the axles nested?

We designed this configuration (longer axle in front and a shorter axle nested behind it), after much road testing in the rugged back country of Baja California, Mexico.  Some very narrow mountain roads had no shoulders, and therefore presented major safety problems when two vehicles were going in opposite directions.  In such situations, standard in-line axles do not suffice; as, in moving to avoid collision, the outer tire of the longer axle will extend off the road.  The inner axle provides the solution, with one tire able to remain on the road, in most situations.  This nested axle configuration also provides:

Much improved dynamic towing stability and better tracking

Unparalleled ability to "turn on a dime," allowing the Mm2 to be moved into areas that even many small trailers cannot access
Ease of changing the inner tire if one goes flat (with standard dual tire setups, you usually must remove the outer tire to change the inner one, not so with our nested axle arrangment)!
  • How is the Mm2 stabilized during and after setup?

Hydraulic jacks located at all four corners and under the center of the unit, provide an amazing ability to both level and stabilize the Mm2.  This inter-connected system of jacks provides unparalleled ability to create a level, stable platform, in just about any terrain condition.

   Additional photos and diagrams (press Back button to return here)

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