These are reservists, with all that entails, good, bad, and indifferent. In addition, not everybody is going to answer the muster to arms.
I would organize a light battalion this way:
1 Co: 4x Territorials, 4x Fuchs, HQs 6/5/4.
2 Co: 3x Territorials, 1x Territorials (flipped), HQs 6/5/4.
3...