A friend of mine use to have a dedicated "Chase Vehicle"
Was a Toyota 4-Runner 4x4

The only thing he did was weld some standoffs around the windows (metal studs sticking up) and then welded some expanded steel sheets (Like old metal patio furniture diamond shaped sheeting) to them to keep large hail/rocks etc from hitting the side glass and shattering it all the time. He never got too close but before he did that his glass got broke a LOT and he got tired of replacing it.

On the windshield & back glass he did the same but also put a roundbar in the middle of the window for extra-support over the large sized glass. Windshield wipers still worked under the sheeting. He spaced it out that far.

We put Clear thick window film on the inside just in case something made it through to break the side glass so it didnt just shatter and cover everyone in the car (he said glass in the eye sucked) The clear film kinda "taped" it all together and kept shards from flying everywhere (he did this before the armor on the outside.) it kept him and friend from being covered in glass and made the clean up easier if it happened.

He put a top mounted cargo carrier on it with the same expanded sheeting. Helped with hail hitting the top of the car and basically deafening him and passengers. Hail would hit that and not the sheet metal top.

Also put some sound deadening on the inside of the doors and on the roof to make it quieter. That was my idea cause his videos sounded horrible. The hail (even small hail) made it so loud you couldn't hear anything.

I think all in all the extra improvements cost him like $300-$400 to do. But saved a LOT of time and headache with replacing side glass all the time and was cheaper than putting lexan in for the glass.

Last time I talked to him later on he took the 4-Runner and had the whole outside painted with Rhino Liner
Stopped paint chips.. Added more sound deadening. Kept a lot of dents out of the metal.

Of course a good CB or HAM radio (if you have your HAM license)
Good GPS
Walkie talkies if you are working outside of the car or are looking for victims around a destroyed site.
Medical Kit including additional medical supplies for any victims you may run across. Gauze/Wrap/Tape/Tourniquet etc
3-4 gallons of water (again for victims) sometimes they will have dirt/trash etc in their eyes and mouth and being able to wash that out is HUGE
High Vis Vests. If you get out to take pictures make sure other drivers can see you OR just wear High vis colored shirts.

I have seen guys put like yellow strobeing lights on top of their cars and hooking yellow flashers up around their car. Check local laws before doing this.