Oneil,
So boat tail extensions is the name for all those wired in parts that look like the rear of the 52 ft Tractor/Trailer is not closed all the way. I'll guess that the curved vertical panel/structures under the Big Rigs also aids in aerodynamics of the rig.
Educational week for me, learned that the hand sanitizer I use at the office can cause my Stainless Steel sinks to rust due to Triclosan and now Big Rig aerodynamics.
Doc
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Sheree & Michael NCNG LTC(ret) with Munpi, RC and Sheba (cat).
2019 Nexus Viper 27V, E-450, 5 speed "Ms. Enterprise", Infotainment Center, HUD, , Safe-T-Plus, Curt SpareTire Mount, ext. WiFi Antenna, Roadmaster Tow Sys& Invisibrake.
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