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Tag Archive SPMT

HMR Supplies manufactures SPMTs

HMR Supplies engineers recently designed and manufactured a pair of SPMTs for a ship builder in the Great Lakes. The company needed to move large ship sections from one production facility to the next within the shipyard as the ship builder was using unconventional methods to move heavy sections between facilities. HMR Supplies provided the solution of a pair of SPMTs so the sections will move easily around the shipyard and maneuver into tight spaces safer and faster.

The two self-leveling SPMT units were designed with the following specifications:

  • 14’ wide X 16’ long (each unit)
  • Six knuckles
  • Stroke height of 18 inches
  • 20,000lb axle capacity
  • Gross load of 60 ton per unit
  • 70˚ turning
  • Two modes of steering – crab and articulating
  • 65 HP Kubuta diesel engine
  • RF wireless remoteEach SPMT unit the HMR Supplies engineering team designs is custom manufactured to meet the needs and purpose of the client project. Recent project analysis and workflow improvements allow the company to produce quality, effective products in a short amount of time.A familiar high profile SPMT project designed and manufactured by HMR Supplies is the 911-memorial tree mover, or straddle mover in New York City.  In addition to SPMTs, HMR Supplies is a leading manufacturer of dollies, and has sold the Holland Dollie® since 1981. The product line includes power units, power dolly, air dolly, crane boom dolly, dual lane transporters and many more custom engineering solutions in the heavy haul transportation, marine and aerospace industries.Contact us if you are interested in learning more about SPMTs.

HMR Supplies – 911 memorial

Remote Controlled Load Transport System 

HMR Supplies completes several large projects every year. A few years ago, our team designed a custom remote controlled tree setting system for planting tress at the 911 memorial. In 2014, we received the patent for this piece of equipment.    

Remote controlled load transport system

HMR Supplies designed the Straddle Mover (a remote controlled load transport system) to meet the special needs of planting trees on the 9/11 Memorial plaza. It was important for the equipment to be able to carry the tree in the center of all the axles, be capable of traversing sideways and able to negotiate openings on the surface of the plaza. There are also up to 8 stories underneath the plaza for access, equipment and a museum requiring low ground pressure and a wider tire base. 

When you see the Straddle Mover up close, on the 9/11 Memorial webcam or on YouTube, it is an impressive site. The knuckle suspension is able to lift and lower the frame and load up to 20 inches. The block and cable system is capable of lowering the load below ground level, and 135 degrees of steering allows the Straddle Mover negotiate the tight quarters on the plaza. A single operator and a remote control operate the straddle mover. 

Although the Straddle Mover was originally designed for moving trees, it can also be used for a variety of applications.   

Creating solutions for custom projects is what we do best. Call us for a quote on your next project.    641-585-3630 


HMR Supplies specializes in designing and manufacturing equipment for moving large, heavy material in the most cost-effective fashion. And for the energy industry, you can add “very long items” to the list as well. Our equipment safely and efficiently transports pipe, vessels and storage containers. Our solutions include moving 300-foot steel tendons in ways that prevent bowing or bending. We’ve designed self-propelled modular Transporters(SPMTs) that safely move these football-field long materials from a fabricating facility to storage areas and onto transport vehicles.  

See our SPMT’s in action at https://youtu.be/sp2be0spPCE.