A rare moment of true realism in this thread. The real vehicles become bogged down in loose material all the time. The tiger was notorious for getting its interlaced road wheels clogged with mud. The solution later in the war was to remove the front outer roadwheel to free up the suspension. The allies were dependent on roads to move as the european fields became quagmires of mud.

My tanks have worked flawlessly on packed dirt and prepared surfaces. Loose rocks and grass have clogged and jammed my tracks but careful driving always avoids damage in combat.