I use covers by a company called Straw Foot Handmade. I've tried them all - including hand making my own - NOTHING comes close to these. Beautifully made, fit perfectly, protect against heat and cold, install in seconds . Not the normal silver foam and plastic material that throws off VOCs and toxic gases and is pain to fold and store - hate those - plus they suck in cold weather. These shades are 100% organic material with insulation, nicely pleated and they fold up / store elegantly. The only caveat - they are expensive and they take time to get - but they truly work and look amazing. Highly finished, they add to the aesthetics of the van, and don't blind everyone walking, driving (or flying) by. Steathy and secure. Best of all - no condensation and no cracked glass.
100% recommend - 100% made in USA.