There has been a recent discussion on a Facebook group of Itasca/Winnebago DP owners where several of us have insulated the area above and behind the front cap cabinets in an attempt to mitigate some of the heat transfer into the coach. Also, most of us are also using some form of windshield cover such as MagnaShade or in my case, I use
Sunguard. I have not personally did temperature before and after tests but, there are others in the group who report a 20 degree difference in ambient temps in the cabinets now when in full sun. I can attest that these two additions in my particular situation have made a dramatic difference. Well worth the effort is how all that have made the modification report.