I have a pair of 1 1/2" furniture pads stuck between each of my antlers and antler pads (near the side latch). This helps the bags stand a little more proud, and cushions them slightly on bumpy roads.
I bought them at Lowes.
http://www.lowes.com/ProductDisplay?partNumber=54257-255-4738495N&langId=-1&storeId=10151&productId=3034740&catalogId=10051&cmRelshp=rel&rel=nofollow&cId=PDIO1