It depends on the state and the weight of the box truck as to whether you'll be required to stop at a weight station.
For box trucks under 10,000 lbs you do not need to stop at weigh stations in any state but if you're driving a box truck and it weighs 10,000 lbs or more then you'd likely need to stop at a weigh station.
There should be signs on the road stating if you need to stop or not and it would be a good idea to stop just in case as if you do not need to stop they'll let you go on through.
Most rental box trucks do not require stopping at weigh stations though since it's not considered commercial.