The core activity of Huber Landesprodukte & Transporte GmbH consists of a combination of three main areas: 1. **Trade in domestic products**: The company sells and distributes domestic products, particularly hay and straw. 2. **Transportation**: Huber Landesprodukte & Transporte GmbH offers transportation services to transport domestic products. 3. **Import**: The company also imports domestic products, particularly hay and straw, for subsequent sale and distribution. Overall, the core activity of the company can be described as a comprehensive offering in the field of domestic products and transportation.