While the market is in a correction, some segments are whistling a more optimistic tune. As of Friday's IBD, the Building-Mobile Manufacturing & RV group was No. 6 of 197 industry groups. Seven months ago, it was No. 56. Three weeks ago, it was No. 29. Here's a surprise: The improved rating comes from the RV part of the group, not the housing part. Within the group, Thor Industries (THO) ties Drew Industries (DW) for the highest Composite Rating