Hi, to eleviate your fears of towing your Sirius21 on a single axle trailer, a few things to ensure are in "excellent condition".
*Tires ensure they are in good shape, of the proper load rating and are properly inflated
* inspect the trailer wheel bearings for proper lubrication and damage
*not sure what tow vehicle you will use, but ensure it's braking system is capable to stop the 2000 lb + weight of the boat.
* ensure the boat is properly aligned on the trailer. We had ours tilted a bit (not aligned)on the trailer and it induced a lot of boat sway.
With proper inspection and service of the trailer and tow vehicle and keeping your speed within limits you will have no problem with your tow. There are a lot of Sirius owners with single axle trailers. Something I wish I had was trailer brakes, maybe one day. Have a safe trip....Bob