Call Heartland Customer Service and ask them. My guess is that they are decals. Mine are. When I had the front painted on mine (the old gray gel coat fade issue) I called them. They sent me a diagram of the trailer with all of the different decals, their company stock number and the Heartland stock number. From that I order new.
I have seen some here mention touch-up paint that came with their rigs so that might be a possibility. But, if no-one here has a definite answer Heartland can help.