All this they are easy to make LOL! Have a look at ours, and exactly what goes into them they are not just a bent tube welded into the end of a chopped off beam.

There is a serious amount of work, with the plates needed to cap both sides of the extended arms, then there is the beam itself, this is the easier part

The joints (we use anyway) are very high quality and the cost is great, there is not as much money in beams as you might think