Yeah, what EP said. The only time I've had any "problem" with the lugs comming loose were the times I run for an hour strait without shutting down and checking stuff. For the ultimate no loose lug solution: tighten 'em up to your desired torque and then spot weld the lug to the shaft. If the nylon part on the lug is worn, replace the lug, or use some blue loctite, but that won't last forever either.
Come to think about it, aren't the shafts on the wrong sides? If on the right side the lug tightens right handed, and the tire resists the turning of the shaft and the lug has a greater affinity for the rim than the shaft, wouldn't that make the lug loosen if the shaft is turning clockwise and the tire resisting (in effect trying to go CCW inrelation to the shaft) due to gription to the ground? Same applies to the left side. If this is a sound assumption, wouldn't the lugs try to tighten if the shafts were swapped side to side? And would that cause a greater problem of the lugs getting so tight that they crush the rims?
Where the hell did that come from? Sorry Pee Wee, I didn't notice that it was you that posted. That rant just came out, but I don't think anyone has posted about the Rt/Lt threaded lugs on the Savage before.