I'm having no luck finding good pictures but expedient fortifications from the Euromaiden protests in Ukraine in 2014 were really interesting. That ones I think are most interesting for T2K are the tire walls. Really just soil/sand filled tires stacked as walls.
A person height wall (filled with soil) weighs tons so you're only going to knock it down with heavy weapons or vehicles. Even a single tire thick wall will stop most small arms, fragments, and block line of sight for attackers. Tires also burn with thick black sooty smoke so if you need to cover movement or escape you just burn down your walls.
Tires are also everywhere. They don't need to be in driveable shape to be used in a wall. A junk yard or tire dump is a nice defensive wall waiting to happen. Your cool castle wall took a SMAW and has a hole in it? Fill it in with old tires and dirt, it'll take another SMAW!
Structurally they're similar enough to HESCO barriers that whole defensive perimeters and internal cordons can be built out of them.
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