21. We have about seven semi-trailer trucks , and about that many people to unload them. 22. The crash involved a large tractor-trailer truck and a pickup truck carrying 20 people. 23. They consisted of large trailer trucks in which up to ten women would work. 24. UPS, which has a large long-haul truck fleet, wants limits on triple-trailer trucks relaxed. 25. This is the first instance of a semi-trailer truck product. 26. "We tell them, ` Our trailer trucks were here before your condominiums . "' 27. Semi-trailer trucks were starting to appear in the marketplace in the 1920s and 1930s. 28. Six semi-trailer trucks transported this collection from California to Ohio. 29. In all, 24 vehicles were involved in the pileup, eight of them tractor-trailer trucks . 30. Trucks need wheels and brakes and semi-trailer trucks need fifth wheels and landing legs.
