From Lawns to Landmarks: How Iowa Earth Works Became a Leading Contractor
Starting a construction company requires a lot of things. Usually, one of the main components is a number of years in the industry. Iowa Earth…
Read more
Celebrating 100 Years Strong
Our Guiding Principles
Mission Statement
Managing a modern fleet of Construction and Mining equipment is challenging. As a trusted partner, we are committed to maximizing our customers’ investments through the life cycle of their machines. We represent the best brands and back them up with responsive, knowledgeable product support and technology solutions, enabling our customers to complete their jobs safely and profitably.
Key Characteristics
1. Safe: We work safely and intelligently and are dedicated to accomplishing our mission with a high sense of urgency.
2. Growth Minded: We embrace opportunities to improve ourselves and the company, acknowledging that profitability is required to best support our customers.
3. Integrity: We engage with customers, vendors, and each other in a positive and respectful manner.
Critical Actions
1. We Take Action: We ask questions, listen intently, and execute with urgency and transparency.
2. We Improve: We continuously seek ways to enhance our customer’s experience, develop ourselves, and advance the company.
3. We Are Appreciative: We value long term relationships with our customers, vendors, and each other.
As RMS celebrates its 100th year in business in 2026 we recognize that while our solutions to customers are complicated, our philosophy is simple: We represent the best equipment brands in the business and back them up with responsive, knowledgeable product support.
– Mike Sill II, CEO
Delivering Excellence from the Upper Midwest to Texas
RMS and our family of companies proudly distribute top-tier construction, mining, shoring, and boring equipment, with comprehensive sales and support operations across the Upper Midwest and Texas. As a multiline dealer, we represent the industry’s leading brands and stand behind them with a steadfast commitment to employee training and service excellence.
Industries We Proudly Serve
At Road Machinery & Supplies Co., we support a wide range of industries with trusted equipment and expert service. From construction and road work to mining, aggregate, material handling, forestry, and environmental processing, our team is committed to delivering solutions that keep your operations moving forward.
- Construction
- Material Handling
- Forestry
- Aggregate
- Environmental Processing
- Mining
- Road Work
Partnering with the Best to Keep You Moving Forward
Our business is anchored by our long-standing partnership with Komatsu, one of the world’s largest equipment manufacturers. We also proudly represent industry leading brands including Astec, BOMAG, Epiroc, GOMACO, KPI-JCI, LeeBoy, Roadtec, Sennebogen, and many more, each aligned with our commitment to quality and productivity.
RMS extends its capabilities through seven specialized affiliate companies, collectively known as the RMS Family of Companies. Each division brings unique expertise to support our customers across every jobsite and industry.
As we enter our next century, we remain dedicated to delivering the best equipment, technology, and service in the industry, so our customers can continue building safely, efficiently, and profitably.
Our Timeline
1926
RMS is founded in Duluth Minnesota by Michael M. Sill.
1955
Twin sons Michael R. And Mitchell J. Sill enter the business and expand RMS state-wide.
1980
RMS becomes a Komatsu dealer.
1994
Michael M. Sill II is appointed the third-generation President of RMS.
1995
The acquisition of Lambert Machinery gives RMS a presence with aggregate processing equipment.
1996
RMS acquires the Bucyrus and Demag open pit mining products from Dom-Ex, Inc.
1997
RMS acquires Herman M. Brown Co., the Komatsu dealer in Iowa.
1998
RMS Rentals is established.
1999
RMS acquires W.B. Thompson, the Komatsu mining truck distributor for the Upper Peninsula of Michigan.
2003
RMS acquires Atlanta Equipment and U.S. Shoring & Equipment Co. is established.
2004
RMS becomes an Astec dealer.
2011
RMS Hydraulic Services is established.
2014
RMS acquires Langer Equipment, the Komatsu mining truck distributor for Northern Minnesota.
2017
RMS acquires Tritec of Minnesota, a welding and steel fabricating company.
2019
RMS Mining Solutions is established.
2020
Brand new branch facilities open in Des Moines and Cedar Rapids.
2022
RMS acquires Pit & Quarry Supplies.
2023
Rochester branch location opens in Byron, Minnesota.
2024
RMS acquires Ruffridge Johnson in Centerville, MN.
2025
New Sioux City branch opens.
Latest News & Blogs
Komatsu utility excavators allow Twin Cities contractor to be efficient and productive
Finding the right machine to fit your company’s needs is imperative to working efficiently and productively. For Precision Utilities, those machines are Komatsu PC88MR and…
Komatsu D71PX dozer helps golf course shaper bring designs to life
When you step up to the tee box at your favorite golf course, you’ll notice an array of slopes, hazards and other unique design elements…
