Re: Trike endorsement required
According to the DMV site, the endorsement is DM. D being your standard drivers license and M being motorcycle. I am not sure about the seperate testing required but I plan to find out. One of the bad things about SC and motorcycle licenses are that most people don't have them. They ride on a learners permit and just keep renewing it because most of them can't pass the skills test.
I know of one guy that has ridden on his permit for 10 years, just keeps renewing it every year. So it may be a "revenue" scam, but anything to get people to demonstrate competency is a good thing in my book.