You will need to ask your major medical isp if they cover you while racing. I had an in depth conversation with our ins rep. She told me as long as I wasn't a " professional driver " I was still covered. Im far from a professional driver! Lol
Things like ins., dot and income taxes are reasons I stay away from any sponsors, big lettering on my trailer or truck or anything that makes me look like a business.
I may be a little paranoid, but it's not paranoia when they ARE after you!!