Quint,The N.H. antique plate rules have very few restrictions.They still list that one line sentence when you look up the antique plate law,but it dates from the first issuance of antique plates.I am not a computer person,and the N.H. gov website is not idiot friendly and as I found out,not complete.I asked about the plate restrictions in Concord a couple of years ago.They found it and printed it for me,and I asked how I could find it on the website and was told it was most likely not there,(although it's supposed to be)or it would take an expert to wade through everything else to find it.If you look up the law,RSA 261:89-a the page has been eliminated.If you look up the next one pertaining to that,259:4 it shows the passage you quoted.The printed one I got in person is three paragraphs long,starting with your passage,but the first word has been changed from only to primarily.As explained to me,pleasure use is allowed,occaisional other use permitted.Bottom line was if you register your 76 Chevy pickup as an antique and use it to go to work every day you will have a problem.I've had antique plates since 1972,the only time I'm stopped is when they want to look at the cars.