We are able here in WA to weigh our rigs at truck weigh stations when they are closed and in some locations while they are open.
Yes, you can go to some truck stops that are equipped with scales. Some do not like to weigh MHs because you want four corner weights. Some truck scales are not set up to do four corner weights.You can live with front and rear weights as you said a couple hundred pounds different between front corners and rear corners shouldn't be a problem.
When we see a weigh station that is closed we pull through to get weights. We then put it in our log book for reference down the road.