Chaosmancer
Legend
I prefer to avoid any need to guess somethings weight.
For example, if I look at moose, I have no clue how much that would weigh. If I look at a ship, I have no clue how much that would way. Supposing someone can pick up an hurl a horse-drawn wagon or carriage. No clue.
I knew the elephant was somewhere in the tons, but couldnt say 1 or 10, and when I looked it up, it is often somewhere in between on average. I should not need to consult google or wikipedia each time a player lifts something! As a DM, I really want to avoid guessing weights.
I strongly recommend referring to carrying capacity by size, not weight.
This is why I have a little quick quide on the chart I use for this.
Here are some basic examples of weights of heavy things
Harley Motorcycle/Normal Horse ~500 to 600 lbs
A Bull ~1,000 lbs
An Oak Log the size of a person ~1,500 lbs
A Rhinocerous/Small Car ~3,000 to 4,000 lbs
African Elepahnt ~13,000 lbs
A moose? Probably weighs a bit more than a bull, but less than a massive log, so around 1.2K. And I don't need to be exactly precise, because things aren't exactly precise. Everything is a range anyways.
So typically:
A creature can carry one size less without encumbrance.
A powerful build can carry the same size without encumbrance.
"Giant Strength" means the ability to carry a Large or Huge load, without encumbrance.
An elephant can be Huge, a whale can be Gargantuan.
Even for irregular loads, like solid metal that might be 50 times heavier, it is more useful to say something like "load as if three sizes larger"
Sure, you could do that. But it ends up having bizarre conotations. A hay bale is large, so if I say a character can carry a large load, they can carry anything from a mattress, to a hay bale, to a cow, to a statue of a cow. But then they need to do something like hold upon an iron gate. Well.... the gate is huge, but they aren't moving it? Well how strong are they? I don't know. because the range is by size, but we don't think about moving things based on their size, but their size and weight.
Your system has some ease of use viability, but it doesn't give me anything to work with for feats that are not directly lifting and carrying around a specific object. The player wants to push over a pillar... can they? Well, if I have some idea of how strong they are, how much force they can exert, I could answer that far more easily.