Morellatops dromedarius seems to be a relative of both the Morelladon and Ceratops genuses, which in itself is rather strange. On top of that, it has developed to ability to store water in its humps like a camel. This makes it a critical part of the desert's food chain, as it provides predators with both food and hydration.
When survivors discovered how to tap into the water in Morellatops humps without harming it, the docile creature became the desert's essential pack animal. Not only can it carry a good amount of weight, but it can provide survivors with a large, mobile water source that can mean the difference between life and death on any given journey.
Morellatops has limited options when it comes to self defense, so I would not recommend taking one into combat. However, so long as survivors don't forget to let Morellatops stop by a well every now and then, they will find the creature an invaluable companion.