The trailing arm type suspension on Bolers and Trillium's are simple but have a weak point. The
tires camber angle is always equal to the trailers roll. As a result if you let the trailer roll excessively you also get excessive camber and the lateral adhesion of the
tires decrease. So if you take a corner way too hot, it is easy for the trailer to slide. This is why "caravan racing" has had some popularity in the UK. There are lots of things that can promote oversteer and a sliding trailer is one of them. So an anti sway bar would both limit roll on corners and so help keep the dishes from falling, and would reduce the tendency to oversteer. Boring, but safer.
On the other hand there may not be much roll to suppress. Roll when cornering is caused by centripetal force acting on the center of gravity of the trailer. If the center of gravity is above the roll center the trailer will roll outward, but if the center of gravity is below the roll center the trailer will roll inward. If the two centres coincide there will be no roll. I think the roll center on trailing link is the center of the axil, but I am not sure. There is an algorithm to find roll center for every configuration of suspension to be found on the Internet, but I couldn't find it for trailing link. Probably there is no algorithm because on cars, straight trailing link has not been used for many decades. I found one reference that claimed that with trailing link it is easy for the suspension designer to set the roll center where he likes (no mention of how). If that is true, it explains why it is used on trailers as roll can be set as desired (minimal or zero), and the expense of an anti sway bar is not needed. When I took the dogs out tonight I rocked the
Trillium and tried to eyeball the roll center. It is low, somewhere between a foot and two foot above the ground, and the center of gravity is also low. I'm kind of keen to see how much roll I get on a traffic circle next time I take it out.
OK I'm babbling, but it is an interesting topic.
Sent from my iPad using
Fiberglass RV
Doug L