Depends on what kind of flying object you're talking about. For bugs, they do make some sort of disposable stuff that sticks on the front. Some were using that on the Tiffin forum. Supposedly put it on, get where you're going, peel it off. Not worth the effort in my opinion. Not to mention your rig looks like crap with it on there. As Todouble mentioned, wax. We put Mary Moppins Advantage on the front prior to transit, but any wax of your choice works good.
Now if you're talking about kids throwing bricks, birds as dave mentioned, or any other object flying through the air, probably not much you can do about that besides leave the rig home, or find a new hobby. A well used rig is gonna get its beauty marks.
John and Rebecca Dickson
Emma-7 / Little John-5 / Iva-1
Full Timing Again, Rev B
2013 Ford F-350 Lariat CC LB PSD
2015 SOB TT - With OC's Awning Poles (#8)
At least in Heaven, RVs will be perfect, and I won't have to keep fixing them.