Hybrids as emergency vehicles

We aree considering a Ford Escape Hybrid, however, I have heard rumours that added electrical devices such as emergency light bars, radio equipment, etc. have caused problems with the electrical systems in hybrids. I like the idea of a hybrid for our patrol usage but I worry about this potential concern. I would like to be sure of my facts. Do you, or anyone you know have any ideas or suggestions on how to research this?