For my tractor I chain the front axle just using the clevis hooks then, with the tractor in neutral, I attach axle straps to the rear and use ratchet straps there. That allows me to get the load really tight and secure. Then I put the tractor in gear and engage the park brake. If I'm going a great distance I might throw an extra chain on each end just to be safer. NEVER have any portion of your ratchet straps touching anything. That's a task for your axle straps or chains. If you don't see a way to avoid that, get straps with chains on one or either end. For a good selection of high quality chains, straps, binders and just about anything else you could ever imagine related to towing or hauling check out <A target="_blank" HREF=http://www.awdirect.com>AW Direct</A>.
Whatever you choose, make certain you stop a few miles down the toad and recheck your tie downs. As many years and as many vehicles as I've towed and hauled not a month goes by that I don't find something that's not as tight as I'd like when I do that little check. Would it really matter if I didn't re-tightne it? Probably not. Am I going to save that 5-10 minutes a trip by not stopping to check? Not in this lifetime. Good luck with whatever you choose.