When Lert bought an M4A3 Sherman 105mm

Lert:   It's sprung, but rather stiff for the weight of the tank, but if you weigh it down with aftermarket parts like metal tracks etc, it'll perform a lot better.   Here's footage of an out-of-the-box model:   The tracks are very tight out of the box, but it comes with a few additional links so you can loosen it up a bit yourself, which makes it run a bit better.