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Tag Archive knuckle dolly

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.

Product Highlight – Knuckle Dolly


Holland Moving and Rigging Supplies has been manufacturing some of the toughest and most durable structural moving dollies in the industry since the early eighties. Decades of experience has allowed us to engineer new designs for specific heavy transportation needs. We now offer over 15 dolly variations and continue to create custom dolly solutions for projects everyday. 

In the photo below we have customized a knuckle dolly for a heavy haul solution that allows the wheels to move in any direction and the load is capable of being raised and lowered. See more custom knuckle dolly systems below. 

Contact us today to talk about a solution for your heavy haul project.

HMR Supplies receives Award for Most Innovative Move

On behalf of HMR Supplies, Liz Thompson and Paul Oulman accept the award for Most Innovative Move from the Midstates Housemovers Association. Our work with the Cheyenne Frontier Days Stage was the award winning project. This project featured the Holland knuckle dolly.  See the video below. 



Project – Stage Moving

HMR Supplies recently completed a large project in Wyoming. The challenge, to design a system to move a 50′ X 80′, 200,000 LB outdoor performance stage 200 yards. The customer requested a moving system be attached under the stage so that it could be move into an exact position between shows at the Cheyenne Frontier Days venue. Customer specifications indicated a 20 minute time requirement to move the stage into place and that the power to move the stage be provided by a two tractors. HMR Supplies designed a system using six custom dollies to move the stage. 

Project engineering, specification drawings, programming, weight performance testing were completed at HMR Supplies facilities in Iowa. 

To complete the project, HMR Supplies manufactured 6 dollies with a knuckle suspension. Steering and height were controlled by a hand held remote attached by umbilical cord and powered by a Holland Power Unit.   

-The knuckle suspension on the dollies was 67.16 inches tall when collapsed and 85.66 inches tall when fully extended provided a lift of 18 inches.  The knuckle suspension also provided a 135 degree turning capability to the stage. 

-Each dolly weighed 10,000 LBS with a 56 inch wheel track, and eight 315/80R 22.4 20 ply tires. 

-Spring applied brakes on the four outside modules for parking. 

-The 100 hp. power unit featured a Fiat Power train diesel engine, a 30ft umbilical to the remote, 3 lifting zones, 2 steering zones, and 2 braking zones, and on board air compressor.  

The project was installed and tested in June 2016. Testing onsite was successful, meeting customer requirements.  

The project highlighted the work that we do best, customizing the Holland Dollie®product to meet the needs of the customer’s project.  

Video of the project test footage and installation can be viewed here:  https://youtu.be/NmxM4O5C8Ig