I have had 4 trucks with the AMP running boards and 1 F-150 and 1 Expy with factory power boards and had zero trouble with them freezing. But I know they are a maintenance item and have to be kept cleaned and lubed. Now my SuperDuty has factory ford running boards and on long trips the snow and ice will build up by the front wheel between the flap, board and door. I have had it so iced up I could not open the door without fear of bending something. My Raptor would do the same so I bet the Tremor ones will to if the weather is bad enough and trips long enough. Oversized flap would help for sure. With power running boards icing up, I'm man enough to take the extra 8" of drops getting out kick the ice free and help my family get out.