tlt has a writeup on longer studs from Arp which have the highest strength you can get probably, plus they are a cool looking galvanized color. only problem is the price (about 100 bucks) but at least you'll never have to buy new ones
http://www.trailslesstraveled.com/news.php?id=59
http://www.trailslesstraveled.com/news.php?id=59