Originally Posted by
troysmith80
PaPa, are you suggesting using an air hose fitting for the hitch coupler? Interesting idea. I wonder what the physical strength of those things is. I've never seen them used in an application where they get much stress.
The idea isn't original. Bike Friday uses and sells them.
https://www.bikefriday.com/thestore/...EFvJ0&cPath=51
Bike Friday suggests a 100 pound trailer gross. However, Bike Friday doesn't specify the 'weak link' that dictates the 100 pound limit - is it the hitch? - the rubber hose - the trailer frame or axle? - the wheels? - or some combination of all?
It doesn't matter what the air coupling was originally designed for. What matters is the anticipated, dynamic loads, and how best to safely exploit its structural limitations.