Basics

This page aims to determine the towing capacity produced by the average person on an average bike
May add other categories later
Mainly used to determine the reasonable capacity of a non-dedicated cargo bike setup (ie a trailer etc)
According to this 15km/hr seems like a reasonable "cruising speed" with a bit of variation
May want real world data
From Wikipedia: "Cargo tricycles can typically carry 100–300 kilograms" (also said human endurance/power is the main limit) (and 50 kg for bikes with basket only)

Bicycle Towing Capacity