Since my rig is so tiny, I stopped using the cart unless I have a really long walk to the stage, like the casinos. It just another thing to store, and some places look at you funny when you roll in gear. There are some venues that won't even allow an entertainer to use the regular hallways or elevators if they are using a wheeled device. I've been directed to service elevators, through kitchens etc because of what seemed to be a "commercial" looking rig.
I can make it from trunk to stage in 2 easy trips without breaking my back and all my soft cases store inside the kb case during a show. This is easily stored under tables, in closets or back in the car if the client requests so. The cart weighs more than any one piece of my gear .... do the math!