gooseneck trailer sides

[JTS Landscaping lawn]

i am looking to put sides on my gooseneck but not sure what i want to make plywood sides or mesh or some short of chicken wire. i use it alot for leaves and now i want to try and beable to hold atleast 10 yards of bark on the deck of it. if anyone has pics or any ideas that might work best. thanks

[gammon landscaping]

when ever i build sides for a trailer i use what 2x4/2x6 for the standers and 5/4 decking boards for sides they look pretty good