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.
Your local home center sells a variety of more permanently attached feet.
Given that you described it as a tank, here’s my first thought