Man only on HN would someone would have the stones to argue “350lb+ drums up stairs [just] sucks”! My dude it may as well be superhuman, do we really need to split hairs here? I think some hyperbole is in order.
Probably an order of magnitude larger than the number who've moved enough 2-400lb objects on it and have a built up intuition for what techniques work and don't for various situations.