Two Companies Come Together

On January 1, 2014, the newly merged Diamond Companies and Roberts Truck Center dealerships announced the name of their new organization. The new company will be called Summit Holdings and will do business as Summit Truck Group, Summit Bus, Summit Idealease, and Summit PacLease.  

In announcing the new name, the three partners, Richard Sweebe, Blaine Roberts and Blair Roberts, said, “We are a new company with a proud 72-year combined history of serving the commercial truck and bus industries. Our new name embodies the strong reputation we have built in the markets we serve. Summit will continue to grow and deliver a higher standard of value to our customers because of our dedicated and talented employees and our commitment to integrity, service and quality in all that we do.”

Summit Holdings offers comprehensive transportation solutions that include new and used trucks and buses, parts and service, leasing and rental, financing and more.

History of Diamond Companies

Dick Sweebe began working for International Harvester in 1972 and served in several capacities before purchasing his first dealership, Mid-America International Trucks in Memphis, TN in 1982.  This timeline briefly describes the growth of Diamond Companies over the past 32 years.

  • 1982:  Acquired dealership in Memphis, TN
  • 1995:  Acquired dealership in Little Rock and Pine Bluff, AR
  • 1996:  Acquired dealership in Russellville, AR
  • 1998:  Acquired dealership in West Plains, MO
  • 1999:  Created Diamond Companies as the holding company
  • 1999:  Acquired dealerships in Kansas City and Springfield, MO and Topeka, KS
  • 2004:  Acquired dealership in St. Joseph and Joplin, MO and Lowell, AR
  • 2006:  Acquired bus location in Conway, AR
  • 2014:  Diamond Companies and Roberts Truck Center merge to create new organization, Summit Holdings

Since 1995, Sweebe has significantly expanded the size and reach of the company. He acquired all or part of five adjoining International dealerships, two bus franchises, two truck leasing companies, built four brand new facilities, acquired and renovated 3 other facilities, and created a holding company, Diamond Companies that owns the stock for all the dealership entities.Today, Dick Sweebe is now Partner of Summit Holdings with Blaine Roberts and Blair Roberts. 

History of Roberts Truck Center

Roberts Truck Center traces its roots back to 1974, when Dave Roberts purchased his first truck dealership--Western International Trucks, in Amarillo, Texas. Prior to purchasing the dealership, Dave worked for the International Harvester Company (now Navistar, Inc.) for twenty years.This timeline briefly describes the growth of the former Roberts Truck Center dealerships over the past 40 years.

  • 1974: Acquired dealership in Amarillo, Texas
  • 1982: Founded Idealease, Inc with ten other International truck dealers
  • 1998: Acquired dealership in Lubbock, TX
  • 2000: Acquired dealership in Wichita, KS, Ardmore, OK, and Oklahoma City, OK 
  • 2003: Acquired dealership in Salina, KS
  • 2004: Acquired dealership in Albuquerque, NM and Enid, OK 
  • 2007: Acquired dealership in Farmington, NM 
  • 2008: Acquired dealerships in Abilene, San Angelo, and Wichita Falls, TX 
  • 2009: Acquired dealership in Midland, TX 
  • 2014: Roberts Truck Center and Diamond Companies merge to create new organization, Summit Holdings. New organization operates in 29 locations, 26 markets, and 7 states 

Since 1999, Blaine Roberts and Blair Roberts have significantly expanded the size and reach of the company. They renovated and expanded four West Texas facilities.  In San Angelo, Roberts renovated the 31,815-sq-ft facility to improve the customer service experience. Roberts built brand new facilities in Midland, Abilene, and Wichita Falls, TX to create much larger dealerships that are easily accessible and a better environment for customers and staff. By 2009, Roberts Truck Center operated 13 dealerships in four states—all conveniently located on major highways across the Southwest region.Today, Blaine Roberts and Blair Roberts are now Partners of Summit Holdings with Dick Sweebe