I use those for my '63 Galaxie, which is a big hulk of a car. I can barely push it myself, but only sideways (that direction offers the least resistance). The floor must be spotless and any roughness will act as little speedbumps. In the Auto Dolly video you will see the guys push cars easily. Notice that the concrete is polished. It makes a big diff. I think if the wheels are of a larger diameter, it will make it easier to push. Check out Harbor Freight Tools. They have a nice selection of casters that could work.
I have a set from Eastwood with composite wheels and ball bearings. I have a 1970 Pontiac Grand Prix (which weighs about the same as new Challenger) on them. It is on smooth level concrete. I can move it by myself but a second person would make things easier.