N.H. Rev. Stat. Ann. § 451-C:9

If the personal property in the rented space is a motor vehicle or trailer, and any of the rent, charges, fees, or expenses remain unpaid for at least 30 days, the owner may have the motor vehicle or trailer towed by an insured towing company. If the owner has the motor vehicle or trailer towed, the owner need not comply with RSA 451-C:10. The owner has no liability to any person for the removal of the motor vehicle or trailer or any damage to the motor vehicle or trailer. Alternatively, the owner may sell the motor vehicle in accordance with RSA 451-C:8, RSA 451-C:10, and 451-C:11.