I am a wedding DJ that takes a serious interest in ceremony sound. For some time now I have been loading up a Muver6 folding cart to house 2 to 3 SKB cases along with battery power, a pelican case, and a cable bag, and I am trying to get a bit more streamlined. What is funny is that I started thinking of a "big wheel" cart for this use before I was even aware that many pro film and other sound engineers have been doing this for a number of years.
I ran across a thread here from way back in 2012 that more or less touches on the concept I am thinking about
I work with modularity