Are you trolling or something?
The Sea truck was created as a middle ground between the Seamoth and Cyclops but does not compare to either. It can only go 100m deeper than the Seamoth but it's slower and less nimble. While the Cyclops can go nearly twice as deep and allows you to craft things on it, which is why some people do not build bases at all but use it as their house instead.
So why would anyone need that shit?