I have a 2002 F150. Unladen weight is 4520 LBS. GWV is 6250 LBS. When I bought the truck used the deal had it inspected the same day and they did not pay for a weight class sticker, which it was a class 2 before. Can I just go to an inspection station and buy one from them? or do I have to go to a notary shop and go through them???