Triplet strollers, while not “necessary”, are a real convenience for parents of triplets or children that are close in age. Any parent that has been in such a situation understands how difficult it can be to do anything with three small children. Being able to keep them all in one stroller can make things considerably easier.
Triplet strollers can be quite expensive when compared to other standard versions. Obviously, this is largely due to the fact that they are bigger, but also because they must be made stronger as well. Many of these use larger diameter tubes for the frame and larger, more stable wheels.
High-end triplet strollers often include features designed to make them even more convenient. Many incorporate seats that can be removed and double as car seats, allowing the parent to move the child from the car to the stroller without having to remove them from the seat itself. Some even include steering devices designed to make maneuvering much less stressful.