The way in which this machine is strapped down is exactly that, strapped down, Not strapped on properly, it can slide along the straps and fall off, the straps should cross across the machine, with each of the straps going from the side of the machine to the opposite side of the trailer forming an X, front and back, four separate straps should be used, the lower the straps can be attached to the machine the better, strapping like this both centralised the pull on the machine and holds it down and in place so that it cannot slip along the uncrossed straping and fall off the side. Remember as the driver it is your responsibility to ensure that the load is secure, no one else.