I have four different trailers that I tow regularly. They all tow acceptably and what I would call safely.
I suspect any difference in how they handle would likely come down to what might happen in an emergency swerve situation, or for instance, running off the road at speed.
My 24' low deck equipment trailer, if it were empty would likely be very difficult to roll, since it's C-of-G is very low indeed when empty. By comparison, my travel trailer is not only taller but has a narrower track width, so would be more likely to roll.
Trailers are generally designed with a short travel stiff suspension which helps them remain more stable in the roll axis since the suspension does not allow as much roll angle compared to a longer travel, softer suspension.
I see potential advantages and disadvantages in both leaf spring vs torsion axles under trailers. Coincidentally, two of my trailers are leaf, and two are torsion. They all work.
We can logically argue that a Corvette handles better than a 4WD pickup towing a trailer. But does that mean you're gonna die in a firey roll-over crash just because you choose to drive a pickup daily ? Well, maybe, maybe not. Up to the user to develop the skills to safely operate anything.
