This article is timeless and should be accurate for any version of the game.
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A specialized vehicle designed by the Bassett Motor Society used in the construction of large structures.
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— In-game description
The BMS - Universal Assembly Rig (also known as a Construction Vehicle, or CV) is an extremely slow logistics vehicle specially designed to build, rebuild, and upgrade large structures.
The BMS - Universal Assembly Rig has 1000 HP and is disabled under 75% health. It has "Unarmoured" resistance, even small arms fire and Flamethrowers are a danger to it. It takes 100 Basic Materials to fully repair it from 1% to 100% health with a Hammer. Its health can be instantly repaired at a Garage for 100 Basic Materials.
Interactions
Can interact with most structures in proximity - press E or Shift + E
Pulls items from stockpiles twice as fast compared to on foot
Can pull three times the normal amount from stockpiles - press Shift + LMB
Its construction arm can build, rebuild, and upgrade certain structures - press/hold LMB
When near the front, it is advised for CVs to be escorted and guarded by infantry due to their fragile nature, as they will help construct larger defenses (such as bunker bases constructed during pushes into enemy territory)
CVs should always be left unlocked when you are done using it so others can use them, because it's the only vehicle that enemy players cannot enter
CVs can still build even if they are damaged (they will not operate if they become disabled)
A CV created by the enemy faction cannot be driven, however you can still access its inventory
Trivia
The BMS - Universal Assembly Rig is the only vehicle in the game that doesn't allow players from the other faction to drive/operate them.
This is a gameplay mechanic to prevent Partisans from destroying a building and stealing a nearby CV to rebuild them for their faction.
Prior to Update 0.48, the 2nd seat used to be the one that operated the arm, as well as its positioning and where it can point the arm (holding RMB towards a destination).
This was later updated so the Driver could do that, as they saw that players weren't using them as a team, and only had one person operating the entire vehicle.
In Update 1.52, the Construction Vehicle underwent various Quality-of-Life changes to improve the builder experience:
Construction Vehicles could now be packaged and transported by another vehicle, however if the transporting vehicle is destroyed while it is holding it, the CV will be lost (this prevents Partisans from quickly transporting them behind enemy lines, and causing large amounts of damage).
The ACV was introduced and had expanded construction capabilities, but the Tech Tree upgrade called "Advanced Construction" (which allowed them to construct all Pillboxes with regular CVs) was removed from the game, which meant regular CVs could not construct them (ACVs had this ability built-in).
Gallery
The BMS - Universal Assembly Rig from the front
The BMS - Universal Assembly Rig from the rear
A BMS - Universal Assembly Rig being built by a Colonial Soldier in front of Town Base