Hi Mufasa and welcome to the Jayco Owners Forum!
Not sure what you mean by canvas ends. Are you talking about the awning?
As for the Fantastic Fan and MaxxAir II... we installed the cover over both the bath and bed vent (of course Fantastic Fan is only in bath). We had the extra $$$ so paid to have it installed
(I was lazy and Don, well... he was lazy too!). But no matter, it is nice as we can leave the vents open when traveling -and/or- in the rain. They work very well!