Shears are not computed. Impact is not included. Front wheel is input first. Truck moves from left to right. You can use as many wheels as you like, with any spacing between wheels.
Moment of inertia can vary.
Springs are allowed. All joints must be numbered consecutively from the left, starting with number 1. Beam numbers are determined internally and are consecutive from the left, starting with number 1. In order to use the program, you must first draw up the structure showing joint numbers and member incidences.