I too used to have fun googling the scores of patents envisioning these ideas: https://patents.google.com/?q=inflatable+aerodynamic+truck&o... - the fun part is figuring out which energy crisis or recession they emerged from (post-1971, post-9/11, post-2008, etc.)

here's a few:

- https://patents.google.com/patent/WO2013182618A1/en

- https://patents.google.com/patent/US20170158260A1/en?q=B62D3...

- https://patents.google.com/patent/US4088362A/en