According to the New Jersey Department of Banking and Insurance (DOBI), most insurers, if not all, require that the applicant chose one liability limit per policy regardless of the number of vehicle's insured as one could attempt, due to the policy language, to make a claim under the higher limit vehicles regardless of which vehicle was involved in the accident.
A solution may to be obtaining a separate policy for your leased vehicle. Getting a separate policy for the leased vehicle would allow you to choose lower liability limits for the other vehicles on their policy.
So what your insurance company is saying is true according to their underwriting guidelines. Most all insurance companies require that the liability limits are the same on multiple cars which are on the same policy. This is as we explained above to protect the insurance provider from lawsuits that a policyholder may file later trying to claim on the higher limits of a different vehicle on their policy.
If you do not want to get a separate policy for the leased car, so that it could carry higher limits and you could keep lower limits on your other vehicles, then you could search around for an insurer that would allow you to have different limits on one policy however we believe it would be difficult to find an insurance carrier that would allow this.
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