Just because you didn't experience issues, doen't mean the same is true for everyone else.You guys are being harsh...I ran a single-axle 6x12 PJ utility trailer for years, with a single 3500lb axle. I transported my B2920 everywhere with it. That was a great trailer, and it had no brakes at all.
A BX is a light machine and a single axle is fine, if you can get enough length. If you are worried about a blowout, make sure you have a spare tire and a jack. Many times, the tow vehicle's jack will work.
Would a tandem be better? Sure, it might be, but it isn't necessary. They cost more and are less maneuverable.
My motto is: Better to have it and not need it than need it and not have it. Grew up on a ranch in MT and have seen all manner of trailering issues crop up when not expected.
Plus we now have several generations of 'drivers' that don't even know what a tractor is, much less understand physics of E=mc2 affecting increased mass of moving objects. Seldom is it our own issue that causes problems, but more often the inattention of those around us.