My gear is so small and light-weight now that I seldom use the R&R cart, unless I have a long ways to move the stuff.
I can unload all my stuff by hand in two trips. By the time I unfold the cart, load everything on it, take it in, I don't save any time, and I need the exercise anyway.
Last time I used it was December and I was on the 14th floor of the Petroleum Club and had to go up in the elevator, so I used the cart.
At my primary job, there's always a worker wanting to carry the stuff in. I usually take the keyboard myself and let them do the rest. A $5.00 tip takes of that, plus they will bring me coffee, tea, water, etc. all night too.
DonM