Years ago I built this table, while it is not the best work, it is the best table I have ever built.
It is very solid, the legs are 4x4s and the top 5 2x6s. The floor of my shop is wood, and normally it is only me moving the table. I stapled pieces of felt to the bottom of the feet, and they worked for a while but now are worn out.
I am looking for an idea of something to put on the feet to make it both easier to move across the floor, and keep the table from marring the floor.
I am thinking pieces of leather may work well. I have tried the plastic things that are supposed to make furniture glide, and they did not work at all.
You might try something like these, or hiding a bunch of rubber/neoprene casters in the bottom of the two "feet". Otherwise, for hardwood floors, thick felt is pretty well the gold standard for anything permanently attached to furniture.
You could also try securing PTFE along the bottoms of the feet, then when moving the table, you lay down a wool blanket or rug, and keep the rug stationary while moving the table across it. You could also flip the table over and do roughly the same thing.
I would second the thick felt pads for hardwood floors
I ordered some thick felt sliders, I had only ever seen plastic ones in stores. I may get some of those dollies though in case I need to move it farther than I normally move it.