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I had to look it up, it’s the technical term for a certain firefighting vehicle.
In particular, what distinguishes it from a normal crew firefighting vehicle (Löschgruppenfahrzeug) is its equipment for “Technische Hilfeleistung” (technical help-providing) which basically means it carries equipment beyond basic extinguishing agents. If you’re physically stuck in your car after a crash, a Hilfeleistungslöschgruppenfahrzeug has to arrive to cut open the doors.
A Hilfeleistungslöschgruppenfahrzeug
A (small) Löschgruppenfahrzeug. Note that it only contains firefighting equipment.