It is supporting the fence top bar. How much support that bar needs depends on how you use the trailer. My aluminum trailer railing has no other support, but it only has to stop my buggy, or rzr from going off the front with me driving them to load.
The winch might put a little bit of strain, if load is rolling it wouldn't be much. Dragging one out of the toolies might bend the fence.
An angled tongue box might allow the support/s to run along side.
The winch might put a little bit of strain, if load is rolling it wouldn't be much. Dragging one out of the toolies might bend the fence.
An angled tongue box might allow the support/s to run along side.