Proper safety chains will hold trailer if it is unhitched! Also in Ontario we are required to clip or lock the hitch when pulling to prevent this. Brake away switch would help by applying brakes
also helping to prevent problems if wrong chains strength used?
People will over load trailers (utility) see it all the time. Have seen tires
over pressurized (common), too soft or wrong type causing additional sway. Have seen a gentleman argue with a tire dealer about what tires
are best! Have dropped back from trailer that had the TV unable to steer properly due to tongue load/improper hitch setup for job at hand. Have seen trailer with axle
alignment out and tracking to the side excessively.
I may not be an expert but read and ask the experts when needed as we all do. Just went to How to Use an Equalizer Hitch | eHow.com
for a refresher on setup while towing ( over 30 years since was shown how ).
At fiberglassrv We are all responsible people and take the time to learn and check our trailers for tire pressure, hitch alignment, brakes
, wheel bearings, lights
, balance our load and other items each and every time before we tow. Most would not pull at the same speed they drive, personally like to stay off of the 400 type highways enjoy the ride doing 80 kmh/50 mph to 90 kmh/55 mph max.
Example: I would not tow over 500 lbs without trailer brakes
even though it is legal personal preference only; we all lean to the safe side when in doubt.
Dangerous Trailers should list condition of TV, trailer, how they had the trailer and car setup. Speed doing 120 kmh or more?