Aries Building Systems’ used modular inventory of classroom trailers, mobile offices, and prefabricated buildings are pre-used, durable, and meet all structural safety and quality standards… available at a fraction of the cost of a newly constructed building. Cut your environmental and schedule costs by eliminating the new resources, pollution, energy, and time involved in building from scratch. Check out our inventory of relocatable buildings – chances are, we already have what you’re looking for. Better for the environment, better for your pocketbook, better for your calendar!