Gerling’s CITADEL MOBILE COMMAND Trailers

Gerling has unequaled experience in the custom design and manufacture of Expanding Side Trailers. We are not talking about the RV-style “bump-out” sides that have somehow found their way into this application. Gerling provides a real, industrial-grade trailer with an expanding side mechanism that is fail-safe, and warranteed for four (4) years, unlimited mileage.

Gerling Expanding Side Trailers are available with either single or dual expanding sides, with expanding side lengths up to 51’.

The Industry’s #1 Expanding Side Mechanism

It may sound overly simplistic, but the key to the success of an Expanding Side Trailer is that the side opens when it is supposed to, and that it closes when it is supposed to! Gerling expanding sides are manual, which eliminates the possibility of an electric or hydraulic device failing. Linear bearing slides at each end do not permit any shimmying or mistiming, and our exclusive floor panel system eliminates actuation issues so common in other designs.

The Most Lightweight Expanding Side Trailer Available, Bar None

Our methods and materials are exclusive to us, and have been developed as a result of experience that only our designers and craftsmen have! There are no surprises at the end of the build, as we accurately compute the weight of every trailer and vehicle we construct, at each point the vehicle contacts the ground, well before construction ever begins.


Gerling Interiors provide an environment that is only limited by the vision of your organization.

A True Understanding of HVAC
Only Gerling has wall mount air conditioners that are custom built for the industry. Two wall-mounted G-Force air-conditioners, from five (5) tons each to ten (10) tons (120,000BTU) each, provide up to 240,000BTU of ducted cooling and heating directly through the equipment racks and into personnel areas. Included are true hot gas bypass all the way down to 0% operation, along with accumulators that enable seamless operation even with altitude change.

The above is just an overview. For detailed information, contact us