well it supported a car yes , the thing even moved up and down , but i broke one of the movable arms off , its in place but i dont know if it will hold a car now .. but in theory it should not be a problem to put a car on there
if you ask me the key is when you build it and place it in a diorama to glue it on the floor if you want a car on it , then it cant flex , the floorplate is really thin and that allows flexing