I have a variety of things on wheels to haul my stuff to a retreat. I have one that's basically a folding milk crate on wheels. It holds all of my Art Bins that hold all of my projects. I have a small Smart Cart from Clotilde that holds electrical stuff, small snap bins with various tools and notions. I have a rolling tote for my machine and I have an office chair I take. I can almost always get my sewing stuff in two trips to the car. The regular clothes, bathing, sleeping luggage takes another trip to the car and of course that suitcase has wheels.
The things I don't take to a retreat are an iron, ironing board and a large cutting mat.