In 5e RAW, a character with 20+ STR could carry one 300-lb barrel so long as they have nothing else worn or in their inventory. They'd be naked. (Carrying capacity is 15 x STR.)
A character with 10+ STR could drag a 300-lb barrel around, but not lift it. (Pushing/dragging capacity is 30 x STR.) I would argue that this would make it (nearly) impossible to position that barrel stealthily.
Just to be clear, I don't think there's ANY need here to become particularly pedantic about the EXACT amount kg/lbs a character should be able to carry.
The general point is: incredibly heavy items shouldn't be trivial to throw around on the battlefield. What's even more relevant, sticking to common sense here wouldn't be a case of "realism hampering game design" but actually supporting it, by giving a very legitimate reason to CONTAIN a potential recurring exploit.
Party control in Baldur's Gate 3 is a complete mess that begs to be addressed. SAY NO TO THE TOILET CHAIN
