As mentioned up thread, Pelica cases are for transporting lots of gears on planes, buses, trains and what not. They are not practical for on location use. Besides, they advertise its contents!
With 3-4 small sized cameras (you probably have lenses as well) and accessories (such as tripods), they might fit into 25L or larger capacity bags. Some with rollers and fit as carry-on.
On the day of the shoot, I'd pick what I need and put them into a day-pack (definitely a backpack). I've done something like this for many years, including film-digital transition era.
If you spell out what additional gears that you take with you, perhaps FTers here might help narrow it down for you.
May I ask why you feel the need to carry 3-4 cameras? Not being nosy, just want to offer appropriate suggestions.