Merge / attach two objects together?

is it possible to attach two different objects to surfaces or vehicles so that they can move together?

reason being, i’m working on a " finctional historical " operation. as such i’m making trucks, various cosmetics, and others important stuff.

so, i would like to attach objects to vehicles that they move with the vehicle and stays in that precise spots.

for example, take the opel bliz tend and put it as a roof for the opel blitz drivable version.
or make the opel bliz weaponized as well by attaching a machinegun on top ( or aa ).

or attach effects to objects as well.

is it possible? and if yes, how.

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