The other option is something custom built. Before Torklift that was pretty much the only option.
There are prefabricated 2" weld on receiver tubes up to 48" long. To fit your 2x2 receiver you'd need to reduce it down with either some 2x2 square tube or better yet a solid bar. Nice thing about the prefabricated receiver tubes is the receiver end is already cross drilled and reinforced.
This solution involves a whole lot of "that looks about right" engineering, because most people simply have no idea how to go about designing such a thing. It also leaves you hanging in the wind for everything. There is no manufacturer to tell you what your contraption is rated for, or to stand behind it if it fails. You're just guessing that this extension won't fold in half the first time you cross a set of train tracks, or won't launch the trailer into the oncoming lane the first time you swerve slightly on the highway.
It is the solution I took, but I went into it knowing I was using material that was as good or better than what commercially available extensions were made from. There are also no welds on my extension to call into question, as my receiver is 2-1/2" and the receiver tube fits directly into it with no need to weld in a reduction. The only welds are for D-rings which transfer the safety chains from the truck receiver to the trailer. I was also only extending 12" so the forces were greatly reduced.