A soothing advertisement

Many years ago, I would drive by the Los Angeles International airport on the my way to work. Near there, visible from the freeway, was a billboard advertisement for some SUV or pickup truck - I don't remember which or the manufacturer. It caught my attention with these three simple lines:
    Climb mountains
    Carry plywood
    Comb beaches (a play on beachcomber)
It has stuck in my mind like a little poem. I present it to you all as a simple puzzle on what makes it coherent. I'll post my observation after a while. BTW, I assume that many or most of the regulars in these groups will catch on more quickly than I did.
--
Jeff Barnett