No contact from insurance, crash was 5 months ago, Hertz/ESIS

A car hit me in January and damaged the side of my 2005 Sprinter van enough that several collision shops told me it was likely to get totaled. Van damage.

The person who hit me was driving a Hertz rental. They eventually assigned liability and sent the claim to ESIS, their claim management company.

ESIS eventually gave me a name and phone number for my adjuster in Kansas City. I've left four messages for this person since 4/30. No contact back.

The car accident happened in AZ in January. I live in WA.

I have Safeco insurance (comp and collision, actual cash value). However, I got the impression when I contacted my insurance that going through them would mean I was using my own benefits and therefore it would likely result in higher rates, whereas getting it covered by Hertz/ESIS wouldn't affect my rates.

Additionally, my van is built out as a camper on the inside (DIY) but it's not specifically insured as a camper van. My understanding is that the at-fault insurance would need to take the value of the camper upgrades into account, but maybe my insurance would not?

I use this van to avoid SAD during the winter months by heading south so it's important to me; I'm anxious about not knowing whether I'll be paid out and keep it or need to find a new ride.

Questions:

Is this time lag normal? Is there something else I can do to make them deal with this? Report them to somewhere? Should I give up and contact my insurance? Is Hertz/ESIS known for this?

Am I correct in my various assumptions (effects of using my insurance etc.)?

Does the fact that the accident happened in AZ but I live/am insured in WA make any difference?

Any suggestions for the camper van aspect of this? I have looked into getting a camper van appraisal but thought I should wait to see what the insurance offered before paying for this.

Anything I should be asking you about but don't know enough to ask you?

I appreciate any help! I am completely new to this.