In OR the scales remain on 24/7. Once I went through when they were open but first waited until there was no truck traffic. A few stations are also flat off to the side so I did a second pass and measured just one side. That gave me the needed individual location weight to calculate the axle pressure. But as Bikeboy57 said the total axle weight alone is a step forward in setting the correct pressure.
There is a old post about one camper moving his generator to the opposite side in order to get the side to side weight balanced. Shame on that rigs mfg.
