^^don't confuse state registration with insurance.
Each company will have their own standards, but none are in the business to write just any 2nd car. From Hagerty:
Rare or "limited production" vehicles, model years 1987 or newer, such as Ferraris, Lamborghinis, Dodge Vipers and Plymouth Prowlers, etc. may be eligible for our exotic and special interest vehicle program. Because these are newer vehicles, Hagerty must ensure that the vehicle is being treated as a collectible and driven on a limited basis.
"Do I Qualify"
Usage
Hagerty provides coverage for collector vehicles that are used on a limited basis — e.g. club functions, exhibitions, organized meets, tours and limited pleasure driving.
Storage
Collector vehicles must be stored in a fully enclosed, locked garage when not in use.
Driver Eligibility and Driving History
Generally, one or two minor traffic violations or accidents are acceptable. We are not able to offer coverage to drivers with a major infraction within the past 3-6 years, such as an alcohol-related offense, reckless driving or an excessive speed violation.* Applicants must have 5 or more years driving experience in the following states: LA, MA, NM, NC, VA and WA. All household driver’s records are subject to review by an underwriter.
Regular-use vehicles
All licensed household drivers must have a regular-use vehicle to use for daily driving. Applicants must also maintain regular-use insurance in his or her own name.
http://www.hagerty.com/Auto/vehicle_qualify.aspx
I drive my K1500 about 1000 miles a year, it is not my DD. Hagerty is not going to insure it.
Then there are the usage rules, like mileage limits and where you can drive it. From what I can tell Hagerty has the least amount of usage limits out there – I’m not covered on the race track, but I am covered in the pits, etc. And that matters when claims arise – they can deny coverage (i.e. not pay) if you are using it in a manner that is outside of the policy limits – so if it says you can’t drive it to work, and you hit a kid on the way to work, you are SOL.