Always chaining the equipment down is very important. I once saw huge bulldozer on a lowboy slide sideways far enough that one track was several inches over the edge of the trailer. It happened so easily - the truck was rounding a curve with a dip in it. The trailer dropped into the dip and the bulldozer stayed up in the air. The trailer went around the curve and the bulldozer kept going straight. That'll make a believer out of you.
I use chains and load binders. I like to hook the chains up so the one on the front is pulling the tractor forward and the one on the back is pulling the tractor backward. Then, I use a spring-loaded binder on one end and a ratchet screw-type binder on the other. I latch the spring-loaded binder first, making sure it's tight enough to compress the spring. Then I tighten the ratchet binder. This lets me get it as tight as I want to. After I've got the binders tight, I put the tractor in low range and lock the parking brake. If the chains loosen, which they will, the spring binder takes up the slack.
Where I hook up to on the front varries - most times I go through the loader tube, having made a wire with a hook on the end to pull the chain through, but sometimes that won't work, so I use the brush guard plate. I wish there was a shackle or loop on the front axle. On the back, I usually go through a shackle I have mounted to the drawbar.