Tow Car auto insurance

Some nice reflection of days gone by in this thread…. What purpose it serves to the OPs question is unclear.
Anyway, OP, get a different insurance company. Without getting specific, there are many reasons insurance companies are finicky about different things. Good news is there’s plenty of competition.
Maybe you had the homeowners bundle and it just caught up w you?

In the service and driving a Corvette. That’s sounds familiar! Mine was a ‘70.

Insurance companies have operating policies that are sometimes difficult to explain. We insured a 1969 Corvette once through GMAC when we purchased it at the dealer. We bought it in Virginia lived in Maryland and both worked in D.C. After a couple months we received a letter from GMAC to the effect that we were being canceled effective that month.
I spoke to GMAC and their reasons were that we lived near D.C. it was a Corvette, and lastly I was in the service.
I called our bank in my home town and got Travelers insurance that day no questions asked. Needless to say GMAC has not been in the picture since.
I could have called Geico and been insured. Can you imagine them denying coverage to someone in the service near D.C.

How is your MH insured? We had a similar issue and were informed we were canceled because we were living in our car. We needed to get a policy on the 5th wheel like a home owners policy, with a related insurance company. now all is good.

Where do you receive your mail? Weve been fulltime 12 years soon to start 13th, same insurance carrier the whole time. Weve changed address three times in those 12 years. Two of those were and are mail forwarding addresses.
What insurance companies want is where you garage your vehicle so they can rate you according to the zip code. No matter how good your driving record is your base rate is determined by your zip code.
If the insurance company says it has to do with the Patriot Act as banks and financial institutions or brokerage houses do. We've shown enough mail from the federal government to prove that our address is recognized as our legal address.
The only thing that I can think of is you have a mailing address in a state that your insurance company is not registered to sell insurance.

We are Escapee members so our "home" is Livingston, TX. That's an RV park but it's my legal residence. A few businesses won't accept the address but the IRS does and my vehicle registrations are all valid.

My car was registered at my Brother's address. NO tribble.
I still don't "Own" a home (Rent an apartment and now it's registered here)

You are a resident somewhere - vehicle registration, medical, drivers license, taxes, etc. Can't you use it? Do you have a PO address?

Find a different insurance company.

Ask an independent insurance agent.