You may want to evaluate an Adco windshield cover for the Ford Transit if they make one now. Not sure if they've added the Transit yet. On Ford Class Cs and Bs based on E-Series vans they work great at keeping heat out. Solar radiant heat is either reflected, or absorbed outside van, so practically all of the heat is kept from entering vehicle in first place. We've used them now for about 20 years and like them a lot. They are held in place by the doors, plus a couple of built-in magnets at bottom to keep wind from lifting them.
I've also seen them listed for Chevy, Sprinter, and ProMaster vans, so Transit model may be available.
Only real downside we have encountered is you can't see out (or in) which works for us for privacy, but limits view out unless taken off (which takes seconds but longer to fold for storage). They are cheap and leave small van-size cab area feeling more open.
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