Commenting as an owner. I believe the company should provide everything needed to do the job.
All trucks should have equipment to handle the work that you are dispatching to them. Let them know that if there is something they need, to feel free to ask. Making their job easier, or quicker to do will benefit the company in the end.
Items such as lockout tools, jumper packs, uniforms, gloves, etc... should be provided. If They would prefer to use their own, that is fine too. Ask them what equipment works best for them, and why. They might have something to teach you.
Keep a record of what is replaced, when, and why for each truck/driver. Reward drivers that take care of equipment, don't just complain about the ones that don't. Good employees are getting hard to find lately, so try to be a good employer.