May I suggest the Alexandrians encumbrance by stone
I will have to read that in full later, thanks.
How about the 'units' be something called pounds and we create a simple chart of how many of these 'units' a character can have based upon their strength. That would greatly simplify all of this
If you just want to worry about weight, by all means...use weight, everything you need is already there.
However, weight doesn't address the issue of quantity of items beyond how much they weigh. A person with an 18 strength can carry 25 long swords and still be considered a light load. Something about that doesn't seem right.
What the above systems appear to be trying to do is determine how many of an item you can reasonably carry, regardless of weight.
The idea of a "Unit" as I proposed attempts to accomplish quantity and weight within a single system...it's not trying to be any more simple than weight alone, but rather adding to the meaning without (overly) adding to the complexity. It also does it in a way that many people are familiar with, even if it is videogamish.
If you dislike this idea, this rule is not for you. You'd also probably hate my ideas for hunger and thirst. But that is the great thing about the game that we play, we can all choose to make it ours. This is the homebrew forum right?