A couple of people asked about details on my covers. I have to insert the caveat that they are not fancy (except one "store bought" one). Also, I currently have an E-350. However that said, I have also used the same type of Reflectix window covers in my non-Ford car, so they are somewhat universal in how they work.
So, for the Reflectix ( let's call it R.) ones, I start out with R. that is "tall enough" to cover the height of the window. For my cab side windows (and car side windows), 24" R. works fine. For the windshield I had to get a piece of the 48" wide R.
Then I make a pattern. I use heavy clear plastic and basically push it into the creases around the edge of the window with a Sharpie tip and then make a line there. Then cut that out and lay it on the R. and cut that maybe 1/8" larger. (Or for smaller pieces I have just pushed the R. directly in and then cut on the crease I made).
Once you have a piece that fits snugly, then if you go around the edge with a "banding" of some sort of tape, it kind of neatens up the edge plus gives a little something to catch around the window (no actual physical hardware type catch, but just ameliorates the friction fit). You can also make the tape band stick out a little further if you cut anything a little short.
For the side doors, that's it. For the windshield I cut a slit leading to a small hole to go around the rear-view mirror stalk (but my windshield is different than a Transit, at least for now...) Then I put the sunvisors down over it. What I like about my homemade R. inside windshield cover is that it's 100% coverage whereas the fan fold ones you buy always leave gaps.
Cover #2 I actually never use, but some people might. They are made for Class C's but of course the cab is identical whether a van or RV. Its' basically one piece that wraps around the windshield and cab windows. It goes under the wiper blades, then has little cutouts (with velcro closures) for the side mirror stalks. There is an elastic band across the top rear corner that hooks over the rear top corner of the driver/passenger door, and then a sew in (fabric covered) magnet for the lower rear corners. Mine is made of Phifertex type mesh (you can see out but it shades some), but many are made of solid naugahyde type fabric. Basically I'm too lazy to use this one. Also, in the rig I have now, the cab is not part of the living area when parked; if it were I'd probably be more motivated to use it.
Cover #3 I hesitate to even describe. It's pretty lowbrow. It's just a large/soft blanket that I had on hand and discovered* I could tie off on the two front corners of my roof rack, run it down so it covers the entire "forehead," and the windshield, and then put it under my wipers and tie the bottom corners around the side mirror bases. It partially covers the cab door windows, and I can close a bit of it in the doors if it's slightly windy. But really this doesn't work if there's wind coming from astern (or you want to look good 😂 ). It does a great job of keeping the sun/heat out though - especially since it covers the forehead too.
*Discovered as a hail storm was coming in and I frantically looked around for something I could protect the cab with.
