How and what do you use to strap your truck to a trailer?

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I have a car hauling trailer and I have been using 2 10k lb straps to lash the trucks I have hauled down. I run them over the top of the frame of the truck I am hauling front and rear and attach to the side anchor points on the trailer. However, the truck on the trailer likes to shift forward and back even though the straps are tight. My trailer only has the side mounts to strap to. Let me know what your using for straps in addition to what I have, and where you are attaching to your trailer. I have no problem at all with firing up the welder and adding tie down points to this trailer. I am looking into getting 2 more straps and 4 axle straps to attach at the front and rear of the trailer. I will be hauling my 71 to the track on a fairly regular basis as well as delivering my brother's 67 short step to him in Colorado. As always, thanks for the info.