Hi will62, I have experienced some RF leaks out of older class D amps based on ICEpower 1000ASP modules. I am talking about amps in production until 2010 or so. Typically, an FM tuner picked up hash unless it was some two feet away from the amp.
By contrast, well designed amps based on Hypex NCore technology like Merrill Veritas or my own Rowland M925 do not leak at all... Not that you would want to do it, but if you had no better logical placement, you can sit an FM tuner on top on an NCORE amp with zero side-effects... Yes, I speak by experience.
Please note that I have no idea about RF leaks from the current generation of ICEpower amplifiers.
G.
Guido