BIKERDAN - I suspect the rain gutter on the OPs HYBRID Trailer is going to be very similar to my rain gutter on my POPUP tent end.
This google photo shows a typical HYBRID RAIN GUTTER above the tent bed end which is very similar to my rain gutter and I am having trouble tying to imagine how a tree limb would do any damage to this extruded metal strip. Stranger things have happened I guess... I can see if the OP was using the add-on rain gutter extensions could be easily damaged or knocked off by a tree limb since they just snap in place.

Hoping the OP can give more info on what was damaged. A PHOTO would be great...
Just my observations...
Roy Ken