Out fishing with Annie on his lap, a cigar in one hand and a ginger ale in the other, watching the sunset.
Join Date: Mar 2006
Location: South Florida
Bikes: Techna Wheelchair and a Sun EZ 3 Recumbent Trike
It also depends on load distribution on the trailer. Ideally, it needs to be loaded just forward of the center of gravity front to rear, and the mass centered along the axis of direction of travel. Loaded correctly, it will never stress the bike sufficiently to damage it. I use a single wheel behind my tyrike and did so when I rode 2 wheeled bikes as well. Actually, the single wheel trailer is superior to the dual wheel for touring because the rear wheel offtrack is only inches off the track of the rear wheel of your bike, nd far less likely to snag a pole or obstruction as you ride. The dynamic is much like a single trailer has offtrack X and the second trailer on the converter dolly is y and y=(x+6") with a 24 foot trailer set like Roadway or Yellow Freight Systems hauls. Your mount + Bicycle is essentially the steerable converter dolly considered a a unit and with the length involvesm, the offtrack is actually less than 1 inch between the rear wheel of your bike and the trailer wheel, whereas the double wheel trailer is like a trailer on a bumper hitch and offtrack in turns is a much larger figure to allow for..
Offtracking explained: https://www.dmv.ca.gov/pubs/cdl_htm/sec6.htm
As to the stress on the rear stays, in motion, the stress is vertical at all times due to the same gyro effect that allows you to ride a 2 wheeled bicycle. It's through the center of the axle to the ground, assuming a balanced load, and unbalanced loads will quickly cause you to stop and reload in a more balanced way if you get it wrong the first time because your bike will handle like crap!.
. “He who fights with monsters might take care lest he thereby become a monster. And if you gaze for long into an abyss, the abyss gazes also into you.”- Fredrick Nietzsche
"We can judge the heart of a man by his treatment of animals." - Immanuel Kant