Meet Our Interstate Family


In Memoriam: Clarence Lee Trentman 1932-2017


On September 29th, 2017, Clarence Lee Trentman, founder and CEO of Interstate Sales and T-Man Traffic Supply INC passed away. He was 85 years old. Since 1958, Mr. Trentman was actively involved in the road marking and maintenance industry. He established Interstate Sales of Auburn, CA in 1969, T-Man Traffic Supply of El Cajon CA in 2012, and was actively involved in their daily affairs until his passing. His insightful leadership, compassion, quick wit, and concern for his family, employees, and business associates will be his legacy. He will be sorely missed by all that knew him.



Danielle is our newest edition. She is the cheerful voice on the other end of the phone when you call our office. Danielle is quick on her feet and is sharp as a tack, if there is anything she can help you with when you call don't hesitate to ask.



Travis accounts for half of our delivery team. Travis seamlessly came aboard and has picked up all the slack within our shipping department like he had been there for ages.



Courtney is part of our inside sales duo. Courtney has helped the company grow and knows every aspect of this company with her 10 years of experience in this field she can help you with any questions you may have.



Mike, Lee’s son, is still learning the ropes here at Interstate. He keeps great people around him, and lets them do all the heavy lifting and thinking. Full time since 1990 and part-time since 1979, Mike enjoys coming to the office and watching "Team Interstate" do their thing. If he can’t help you find what you’re looking for, he knows someone that can.



John has been with Interstate since 1986 and is our wood, steel, and Weedmat estimator. John has expert knowledge of Guardrail, Bridge Railing, and all its specifications and accessories. Give him a call. He’ll fix you up.



Valerie is the newest addition of the Interstate Sales Team. She has been an outside Sales Rep in the traffic industry for 15 years. Some may remember her, as she had worked for Interstate Sales from 1996 to 2005. This is a happy return for the company.



Lou is a welcomed addition to the Interstate family. Lou has been in the traffic industry since 1976, having worked with some of the most well known companies in California and Nevada. He is our in house go to person for knowledge on Graco products, having sold them since 1990.



Leslie keeps count of all the pennies, and accounts for all of us. Not just a numbers cruncher, Leslie is always available to answer your billing questions and see that you get the best bang for your buck.



Ed is "The Keeper Of All Things Inventory". He keeps our warehouse precise and organized, polished down to the last washer. Without Ed, the effectiveness of our team would fall apart. He really is the duct tape that keeps us together. Next time you see him feel free to give him grief about his beloved SF Giants.



Kevin makes up the other half of our delivery team. Logging countless hours on the road to get your shipments to you on time.