The best replacement for running boards is nerf bars.

The best alternatives to running boards are rated as following:
★★★★★  nerf bars
★★★★  side steps
★  tube steps
★  step bars
★  steps
★  step tubes
  nerf bar
  no running boards
  running bars

Your alternative for running boards is not listed? Suggest!
Speaking about running boards, one probably shouldn't forget about flares.

Other search terms related to running boards and their ratings are:
★★★★★ flares
★★★★★ fender flares
★ lights for honda pilot
lights pilot
You have in mind a companion for running boards and it is not yet here? Propose!



Google Trends

Scale is based on the average worldwide traffic of running boards in all years. Click on graph for more.
running boards
nerf bars
side steps