I also vote for the MaxxAir. One of my fav self upgrades along with the vortex vent fan. leave our vent open almost all the time.
2011 Jayco Jay Flight Swift 264BH
2008 XLT SCab 5.4L, FF, 4X4, 3.55 LS, Gotts Mod w/Drop in K&N, Holley Hooker Aerochamber Muffler, Edge Evolution, Tekonsha P-3 Trailer Brake Controller,33.5" Nitto Terra Grapplers.