I had planned to add some sort of air defector, but so far I haven't' seen any issues from having air bother them. I think the front of the trailer is probably putting a large majority of the air well over the top of the solar panels. I could be wrong. They are about 18" from the front of the trailer and the leading edge is only about 1.5"-2.5" off the roof due to the compound angles of the front of the roof. Most the fasteners are into 3/8" plywood and wood trusses. I couldn't wiggle them when mounted.
If I come across something like a pair of wind deflectors found on pickup back side windows, I might still add them.
With the weather turning good, I'm sure getting the itch to get it out and enjoy it some more.