You're getting goof advice. Anything from dowel rods up to 2" PVC will move just about anything over a smooth surface. Furniture moving dollies also work well on concrete.
If it's very heavy, you want to secure it in tension in two directions, ideally -- meaning you're using a come-along to pull it, and you have a way to control movement in the other direction (like a rope you've wound around something stable, that you can slowly unwind).
You never want to actually lift anything heavy up in the air if you can avoid it. You want to use levers to move it, and a wheel (or cylinder) will function as a great sort of infinite lever.
You also want a solution where you can walk away from the load and not have a catastrophe. For this reason, hand trucks can get scary with really heavy stuff. But sometimes that's still the only (or most effective) way.
A few months back, I had to move every piece of furniture out of my house so the floors could be refinished. I had to do it all in a day and without any help. I did it in ways that meant I didn't even have to unload the breakfronts (or whatever they're called) loaded with dishes and china. I don't think I actually lifted anything in the course of it -- just floor protection and dollies and dowels. It's a slow way to do it, but I've never had back pain in my life.
This is a 510-pound piece of steel plate that I needed to move from my Jeep to a cabinet. I had 2x4 rectangle tubing available, but a bunch of 2x4s or 2x6s clamped together would have worked.
I just moved it slowly on metal dowel rods.
For really big things, I use levers. For these 700-pound cabinets, I attached scrap 2x4s together so I could lift the thing in steps with a lever and then have it rest at each step. If it fell, I'd be out of the way.
I do also own a hydraulic table now, which was a worthwhile Harbor Freight buy. Here's a smaller (500-pound?) Strong Hold cabinet. Easy to roll anywhere. (Although of course you lower it down before you move it.)
But getting stuff like this down from the truck can be tricky. Here's my 950-pound lift coming down off the bed. The chains are attached to a come-along, and there was a rope controlling slide in the other direction. Again, I was out of harms way if everything suddenly fell. That's important when you're stupid enough to move big stuff by yourself.
Don't tell Home Depot I use their $19 truck rental to move all my big stuff.
