The primary market for double-tube Type I life rafts are larger corporate and transport-category aircraft. Most pilots of light GA aircraft will find them too heavy and expensive for their tastes. However, one of the unapproved basic double-tube rafts will provide far greater redundancy than a single-tube raft for not much of an increase in weight or bulk.
This is a companion discussion topic for the original entry at https://www.avweb.com/ownership/aviation-life-rafts-part-fourdouble-tube-life-rafts