How about the old fashioned Rope and Pulley, and an inclined plane?
When the twins were still Cub Scouts, I demonstrated the usefulness/mechanical advantage of a pulley system, and had them pull the van 20 feet in the driveway.
Later, on a Boy Scout camping trip, I set the big kids against the little kids in a tug of war. The big kids won easily, but after giving the little kids a 2 to 1 advantage with a pulley, the little kids won.
I'm not the man I once was. Thirty years ago, I bought two of those Sony 36 inch Trinitron TVs. They weigh 270 pounds. My neighbor and I carried one of them around to the back of the house and into the family room. Today, I might be able to carry my half about 5 feet.
A couple of years ago, I decided to push the one in the living room to the curb, and replace it with a digital LED TV. I was alone, and impatient, and used a pair of 2x4's to slide it down from the TV stand onto a dolly. The darn thing was so heavy, that it snapped one of the 2x4's. I rolled it on the dolly to the front door, and gave it a shove, and watched it roll down the stairs. I was surprised that it didn't break more than it did!
A couple of weeks ago, I was dreading trying to get the other one out of the basement. Ah, a pulley system!
I strapped the TV to an appliance hand truck, and rolled it to the bottom step. I tied a 30 foot line (with a bowline) to the axle, and at the other end of the line, another bowline, to which I hooked a 4 inch pulley. I anchored another line to a fence post, and ran it through the pulley. When the twins pulled on that line, (with a 2-1 mechanical advantage) it worked out really well.
I used the same method to bring my gun safe out of the basement. Man... that thing is heavy!
Wheels... inclined plane... rope and pulley... big grandkids

They all work as cordless power tools!
