510 ultra lite includes aluminum cabinets and helmet rack. 614 sport includes a/c, aluminum accent, side window with blinds, entry door and fold up sofa bed. 716 sport includes pull down rear screen, a/c, aluminum accnt, side window with blinds, entry door, fold up sofa bed and dometic porta-potty. 816 sport includes aluminum cabinets, pull down rear screen, a/c, aluminum accent, second air vent in cargo area, side window with blinds, entry door, with window, fold up sofa bed and dometic porta-potty.