Is this a brand new Airstream or an older vintage model? If it has a new or late model converter in it, it might be easy to change the input voltage. Some newer power supply circuits only require changing cables, jumper wires and/or internal switches to change to "international" voltages/frequencies. Also "Hertz" and "cycles" are used interchangeably in electronics and scientific terms, so no problem...
You should check with the manufacturer or do some research on the Internet before hooking the converter to your household AC voltage supply.
Regarding not using a brake controller or surge braking system, I strongly recommend you have the proper system installed before moving the trailer yourself.
When we were still using our old tow vehicle, I had the brake controller wire pull loose from underneath our pickup, which effectively disconnected the voltage from the brake controller to the trailer brakes. This happened while we were driving in town at around 30 mph. Before I could find a place to stop and check to see why the error message was flashing on the brake controller, a traffic light changed and I was unable to stop and rolled right through a red light. I had sufficient distance to make a normal, gradual stop had the brakes worked. However, without the trailer brakes, I rolled right through the intersection at about 15-20 mph. Luckily, the cross traffic saw what was happening and waited for me to make it through the light. Scary!
So, don't think that driving slow will save you from an accident. Certainly, it will help, but maybe not enough to avoid a crash.
Again, just my opinion (but from previous personal experience)...