HBarlow is correct... ... However you might be asked to purchase a trip permit for each state you travel through.....
Apportioned plates spread around you money based on your travel through those states... based on a per mile bases and the overall mileage you travel a year...
For us... it's less expensive to have apportioned plates on 1 of our smaller trucks than to pay the trip permit costs to travel through those states and Canada..... For example, a trip permit from ID to Edmonton Canada from Spokane WA requires a trip permit for ID, BC, and Alberta..... the apportioned plate and the record keeping over the year is more cost effective than the 24 trip permits... . 2 trips per month x 12 months...
Not all states require trip permits under 26K lbs... but some do... .
Hope this helps... .