The invention relates to a bracket-mounting assembly for mounting a bar bracket to a vehicle frame, the bar bracket being adapted to carry vehicle accessories such as a mudflap. The filler includes a hydrocarbon-based liquid and an agent to cause the filler material to have a rheological property that is substantially different than a corresponding rheological property of the hydrocarbon-based liquid. The second interface may comprise a plurality of antenna contacts located along tracks of the electronic device used to aid reception of the radio card.