(a) A permittee may request a permit amendment for a substitute vehicle which complies with all requirements and weight limitations of that category of permit. If an amendment is made to add or delete trailers, those additional or new trailers must comply with the weight limitations and any requirements of that category of the permit.

(b) A $50 fee will be charged for any amendment (unless otherwise indicated by this Subpart). For each new trailer to be listed, an additional $10 or $20 fee will be charged based on permit option. The department will provide an amendment application form. Changing categories of permits are not allowed by amendment.