Does anyone else have a problem with their expanded metal ramps being slippery in wet weather or with wet soles on your shoes? When the trailer was new the ramp had sand in the paint on the ramp. Worked great until the sandy surface worn down and in some conditions it is very slippery. Not with all soles. If the soles are made of soft rubber the ramp works great. Otherwise with some soles it is as if it were greased. I have even considered coating the ramp with some of the urethane bedliner paint designed for trucks. Any suggestions? Thanks, Cleve.