I'm talking about low down, and if the window cranks all the way down, there'd still be room forward of it, right behind the seat - or like others do, put it under the seat .... you want heat as low as possible, it's not going to heat the area from above unless there's a strong fan blowing straight down, folks are always complaining how hard it is to heat the cargo area, a curtain right behind the seat makes the front heat better
looks like that's a 'coach built' school bus conversion
Bill