Thor Industries (THO), among the world's largest makers of recreational vehicles, has climbed above its 10-week line as it builds a new base. The stock has risen for three of the past four weeks as it forms the right side of the cup-type base. It's about 5% below a new high. Thor, which makes Airstream RVs as well as travel trailers and commercial buses, is benefiting from a rebound in demand following a sharp downturn during the recession. "The