We have these shades on our cars and love them:
Eclipse SunshadesI just got back an answer from the company that any Ford E-series chassis can use their “Econoline/E-Series” shades, so I'm off to buy a third set.
Not only do they keep the heat out, but they also provide privacy, easily and quickly from the inside of the coach, so all I have to do now is work up something for the side windows and I'm done. (I just hate that ugly snap curtain that came with our Winnebago.)