There are many different types of equipment. Whether you supply computer equipment, parts and software, vehicles, industrial equipment, musical instruments, cooking equipment for restaurants... .equipment is hands-down a domain extension you must register for your business.
Sure you can (and should) register "yourcompany.equipment", but you can also get creative and register "thebestcomputer.equipment" to market your business in different and innovative ways. Registering a .equipment domain name is an opportunity for you to tell your customers and prospects exactly what you are offering.
Do restrictions apply to some .equipment domain names?