I do not know the specific details of the contract between Triumph and individual dealers. I have heard of automobile dealers charging MRSP+, but have no personal experience or evidence of said practice. As much as I love riding, a motorcycle is a luxury or discretionary item. Personally if a motorcycle of any brand tried to charge me MSRP+ I would be out the door never to return.
"Suggested" is the key word. Dealers in general play games with "fees" that while not specifically raising MSRP, really do raise MSRP. HD dealers have done it for years. If the market is tight as it is now, dealers will try to get top dollar.