Rough Terrain Double Buggies
Once upon a time there were prams. Then manufacturers started making buggies. While they are both basically the same thing, a double pram that can be pushed over rough terrain fits the phrases double buggy and twin buggy more than it fits double pram or double pushchair. Generally a rough terrain double buggy is a lot hardier, and more adaptable than most other types. For example they have three wheels (not four) and their suspension is superior. One example is the popular EasyWalker DuoWalker Twin Pram. 
The EasyWalker double buggies are lightweight, stable, slim and very easy to manoeuvre. They have three wheels that swivel and a push bar that is adjustable. Best of all, they will last a long time because they are suitable for little ones from birth to four years.