Double bogies drive me crazy!  Seriously, Sherman fanboys can defend them all they want, but there is a reason that most modern tanks use torsion bars, and no-one uses double bogies anymore.  As you may know, most of the tanks in my collection are Soviet, and most Soviet tanks, even during the War, used a torsion bar suspension, as did many of the German tanks, especially the late-war heavies.  The same cannot be said for British or American tanks, which have complicated bogie suspensions that take a long time to render.  The problem is only made worse by the fact that 3-view drawings don't show how these mechanisms are constructed, so I end up spending hours at a time looking at photographs of both the real tanks and plastic model kits trying to get a good idea of how to make them.  The first time I went through this was with the Valentine Bridgelayer, which has two mirror-image triple bogies mounting road wheels of different sizes.  I had made my own tank with a double-bogie suspension based on the Soviet T-35 prior to that, but it doesn't count because I wasn't trying to copy anything.  I wound up featuring that in a video.  The other examples are shown below: