Though Workhorse does have a "Fix" for this (An air flow improvement package) The chassis does NOT have air flow problelms... Some RV companies build the area around the engine wrong and as a result cause a problem that does not exist as shipped (But then as workhorse ships them there is NEVER an air flow problem
.
Other companies build with air flow in mind.. It is all up to the coach builder
But Workhorse is paying (for some reason) for the cure if it happens.