No noise from the bottom shelf at all. I'm probably going to invest in some rubber tool box liners for each of the shelves to keep the wear and noise down.
The only noise I heard was from the 3/4" seat pole moving in the 1" flag pole bracket. I'm thinking about finding a plastic bushing to make it fit better.
Just a thought, rubber or silicon bushings might work out better for noise reduction. Also if you put an ice chest on the bottom, think about the soft-sided coolers with the flip-top opening so you dont have to unzip it each time also they will make less noise than the hard plastic coolers