N.H. Rev. Stat. Ann. § 266:17

The driver of every motor vehicle shall, upon request of any law enforcement officer, stop and submit to a weighing of said motor vehicle by means of either portable or stationary scales. If such scales are not available at the place where the stopping occurs, upon request of a law enforcement officer, the driver shall drive said motor vehicle to the nearest public scales provided the distance to the public scales does not exceed 10 miles.