Command & Conquer’s MCV
Also known as the “Mobile Construction Vehicle”, this behemoth of a vehicle is slow but gets your army groundwork going once it finds a nice place to park itself.
Imagine a mobile home but one that opens up weapons of mass destruction against NOD. Or GDI, depending on your faction of choice. Also, you get some kickass Frank Klepacki music playing in the background as your MCV gets to building and mining.