Just remember that most accidents happen within 5 mile of home. Dual axles are important, but so are dual brakes. If you have brakes on only one axle, you can still get into trouble quickly. An object in motion tends to stay in motion. If you have to make a panic stop, remember that the 1200/1500 pounds of trailer with 2000+ pounds of weight are going to want to continue moving forward when you want to stop quickly. All of this can cause a major problem when you can least afford to have it happen.... near home where there is a lot of vehicle congestion...... that is if you live in town.... If you live in the woods like some of us, then a single axle might get you by if you don't experience crowded streets.
Also keep in mind, that the tractor isn't covered for physical damage while on the trailer and off the property unless you have a separate rider or policy for that risk. Most, if not all homeowners policies only cover the equipment that is used to service the primary property. There was a long discussion about this a few months ago. If I can find it, I will post it later....