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I've noticed that there is a big difference in how much different people tighten their tie-downs. Seems like some guys are trying to break the straps while others are content with just snugging them up. Personally, I think excessive tightening just puts undue wear on all components involved, especially the strap itself. If the straps are just snug, where can the boat possibly go? Is there any published data on this or is it just guess your best?
According to Pro Series Kwik-Lok, tie down straps [B][U]lock any boat transom to the trailer [/U][/B]via an adjustable strap with S-Hooks. Use tie down straps for extra safety and security when trailering your boat.
From my standpoint, the true purpose of the straps is to make sure the boat [B][U]moves with [/U][/B]the trailer. Keep in mind most trailers flex in the middle from front to rear as they are trailered down the road. The rear straps keep the rear of the boat from moving around as the trailer flexes up and down. The boat hull des not flex, so the straps keep the boat's stern from going airborne when the trailer's rear section dips down when the ceterof the trailer is bowing up.
I'd agree, you need as much tension as it takes to keep the rig down on the trailer. I'd experiment. Some trailers flex more than others. If too loose the straps can come off as the rear of the triler flexes up. My pontoon triler flexes like a limp noodle, so I do the white knuckle routine on the straps to make sure the boat stays on the trailer. More rigid trailers, may mean you can exert less strap tightening.