Tailgating implies without consent (similar to a car tailgating another vehicle on the freeway), while piggybacking usually implies consent of the authorized person.
The original usages piggybacked on the concept of connected knowing, which emphasized the importance of context in the development of knowledge for women.
It has 20 rescue cruisers (usually piggybacking a smaller rescue boat), mostly operated by own full-time personnel and 40 rescue boats operated by volunteers.
