>>1744793some limited streamlining is seeing use, but there are inhibiting factors beyond initial cost.
Some solutions will introduce sizable limitations in cargo-volume/ dimensions (see
>>1744845 for example) or weight (all those reinforced plastic panels and their mounting equipment do add up). Other solutions, such has the flaps posted in that post offer minimal improvements for the price of highly increased complexity. Pretty sure I read about that specific solution having a considerable tendendy to get stuck. And when they're stuck, the truck can't reach the cargo-ramp to load/unload. Not a satisfying scenario.
The covered wheels for instance would also make access to these worse, compromising service cost and even safety (driver won't see that something's wrong with that wheel before something serious happens). Meanwhile gains are marginal at best.
