It may be what you are referring to as their "main" site. Not sure of their division hierarchy, but Shasta is listed as one of their main branches here, along with Forest River RV, Prime Time, Coachman, Palomino and Dynamax:
Recreational Vehicles | Motorhomes, Travel Trailers, Fifth Wheel, Tent Campers
The confusion with names may be if going to the Forest River RV site. FR RV is a division of FR, Inc.
I guess it's kind of like New York, New York. City and State with same name.