I enjoy my single axle.
Unfortunately I've experienced a few blow outs, probably from overloading. The trailer never "tipped" dangerously, and certainly wasn't anywhere near tipping over. Of course, my tow vehicle out-weighs the trailer by almost double, there is no tail wagging the dog here. Those towing a heavy trailer with a light tow might experience more excitement?
Redundancy is bolted to the back bumper, the spare tire. No big deal to swap it out, but I'm on the younger side of things and able bodied.
When I was on the road to Alaska, and had a blowout around Destruction Bay, I used my spare, and bought a spare for the spare which then lived in the truck bed. Having two spares, I needed neither for years after that trip.
The cargo capacity is the only draw back I run into with my single axle.