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The Riverside Co., a global investment firm with 20 offices in 14 countries, said it acquired Midnite Air Corp., Los Angeles, and will help the company expand its courier operations.

QualaWash Holdings said it has acquired Stallion Tank LLC, Salt Lake City, and Sparkle Klean  LLC, Charleston, W.Va. Terms were not disclosed.

Boyd Bros. Transportation said Tuesday it has acquired Mid Seven Transportation, Des Moines, Iowa. Terms were not disclosed.

Printing and mailing company R.R. Donnelley & Sons said it has acquired Express Postal Options International. Terms were not disclosed.

In preparation for an acquisition or divestiture, carriers must be conscious of the challenges associated with these transactions. Too often, owners and management come to the deal table wishing they had been better prepared.

Los Angeles-based private equity firm Platinum Equity said it has acquired Pennsylvania carrier Keen Transport Co. Terms were not disclosed.

Red Dot, which makes heating and air-conditioning systems for trucks and other heavy vehicles, said it will purchase JBAR A/C, which makes that equipment for construction and material-handling customers.

Houston oilfield service and tank truck operator Select Energy Services has purchased Carlsbad, N.M., counterpart Riverside Transportation.

Truckload hauler Gordon Trucking said it has acquired Buske Lines, Edwardsville, Ill.