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.



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.



Courtney is part of our inside sales duo. Courtney has helped the company grow and knows every aspect of this company with her 13 years of experience in this field she can help you with any questions you may have.



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.



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.



Julie joined the sales team 2 years ago and jumped right in to learn all the product lines. She is a reliable and helpful part of or sales team ready to help you with your next order.



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.



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.



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.



Britany is our newest edition to the sales team. She is the cheerful voice on the other end of the phone when you call our office. Brittney 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.



Terry is a man of many talents, and he uses them all at Interstate Sales. A seasoned commercial driver, he'll deliver your order to your destination of choice, help pack and ship orders in the warehouse, and most recently has taken on the sign shop fabrication process for us. If we made your sign, you can thank Terry for the service. Any sign shape size or design, he's got you covered!



Natalie is the friendly voice you hear when you dial our office. She is smart, efficient, and not only transfers your calls but transports our customer service reps to you so you can get what you need to get the job done. As the hub of our office, she'll take your payment, send an invoice, type up your order, or all three practically at the same time. She looks forward to helping you.