- 35 Configurations - Advanced Engine Models The Wentward 5000 Series is a series of heavy duty trucks based on the Gavril T-Series, manufactured by Wentward from 1981 to 1996. It may not seem like much of a difference, but the Wentward 5000 actually featured a shorter front end, different interior, 3 different frame options - 5060, 5070 and 5070 Extended and more. It was offered with several engine options ranging from V6 and I6 diesel engines to V8 diesel engines. The engines used in these trucks were designed and manufactured by Knightonn and Gavril Trucks. You can attach any gearbox to the engine of your choice.