I am going to add mud flaps also. Got quite a few rock chips on the front window cover when we went to Alaska in 09. Will have them on before going back to Alaska in 2012. A dense piece of foam in the gap at the bottom of the tip out door will work out best as I see it. If anyone on the forum has a better idea, I am open to it.
Anyone with a 2010 HI-LO should consider trying to get a cover from JR or a used one from a wreck to protect that window. If nothing else, mud flaps for sure. If the covers are not available let us know on the forum and I can help you find someone in your area who can make it or help you make it. This is not a difficult item to make. The front window can be duplicated with a bit more skill. There are many plexeglass/acrylic canopies and fiberglass panels being made by companies and members of the experimental aircraft assoc.
Jim L & Faye
2003 Silvarado diesel crew cab
2017 Silvarado, crew cab 1500 6.2L gas w/ 8 speed tranny