How do you determine wagon capacity?

[Gamebird]

The PHB says that a character can generally push or drag along the ground, about 5 times as much as they can lift. It says this can vary a lot, if the item or ground is slick, it can be higher; if the item snags a lot, it can be at half or lower.

It says nothing about wheeled conveyances. So how much can you put in a wagon and still have it pullable by a normal heavy horse down a road?

(please, no answers like "whatever works for your campaign" or "whatever works for the plot")

[Quietus]

The PHB says that a character can generally push or drag along the ground, about 5 times as much as they can lift. It says this can vary a lot, if the item or ground is slick, it can be higher; if the item snags a lot, it can be at half or lower.

It says nothing about wheeled conveyances. So how much can you put in a wagon and still have it pullable by a normal heavy horse down a road?

(please, no answers like "whatever works for your campaign" or "whatever works for the plot")

Whatever the drag limit is for the thing pulling it? Maybe double for it being on wheels?

[Shhalahr Windrider]

The Arms and Equipment Guide has stats for various vehicles that include vehicle capacity by weight. A basic wagon weighs 400 lbs. and has a cargo capacity of 2 tons. Two heavy horses can pull the wagon at a speed of 35 ft. even when fully loaded, according to the stat block.

[goat]

As far as I recall:

The used weight is the total of the cart and everything on it divided by 4. Then you use strength as normal.