[Snowtractor]

And a pic of the cross chained and boomed down load...and of course the buddy. If you're not comfortable with with type of load binder then you can get a rachet one. The rachet binders are preferable where inexperience is involved. The bear claw type boomer generally needs to be open and closed and reset a couple of times to get the slack out of the chain. Also you need a cheater pipe to get the tension in it. Of course you don't want a 6 foot long cheater , in this case, or you can overtighten and bend things. Properly tightened your load isn't going anywhere. I've seen tractor trailers on their sides with the loads still boomed down on the the trailer tightly when done right.
Sean