I completely understand why the regulations are in place but with all the technological advances in the food industry, the government doesn’t keep up. There are numerous precooked items currently available that can easily and safely be heated on a cart such as bbq type items, Walmart and RD carry precooked then frozen burgers which can be reheated in minutes on any cart with a grill etc, etc. As with most laws they are put into effect when a need arises but then sit there unchanged for years often to the hindrance of the public. I agree with BillyB, start with the HD. You could also craft an educational letter about currently available products and how preparing them is no diferent from preparing hot dogs or precooked sausage and send it to all your representatives over and over and over. Sometimes the squeeky wheel gets the grease.