For transportation, if you plan to fight crime, you'll want to have at least two different modes of transportation that are, at least, difficult to connect between either identity. The car is great for personal use and transporting stuff like donations, but if you use it in your personal life, and then use it when you're fighting crime, somebody will eventually catch on. They'll connect the ride to the rider, and if your intervention was too much of a convenience, personal offense, or injury to their plans, they'll get back at you, as much as possible. If you have no other option for transportation, consider changing how it looks somehow. Going with a popular, common colour of paint and upholstery is a good option, if you can. An additional option is to put on, or take off, is some sort of decal that will draw attention to a certain point, rather than to the entire car.
The training dummy may be workable, given your current supplies. As you get more resources, you may consider investing in a BOB.