I just moved a truck load of furniture and had to unload it with only my wife’s help. To make our lives easier I took a couple of 2″ endless slings which would go under the feet of the sofa and other large pieces. This allowed us to lift with our legs and not have to bend over which puts more strain on your back. The ones we used had a 5 foot length (check the link below to find out how they are measured) but they could have been a bit shorter (the excess length did not matter so these are better too long than short).
The polypropylene webbing is nice and soft so it doesn’t hurt what you are lifting. With a cost of $7.25 each these really are a tool you need to have in your moving kit.