I had black Maxx Air vents on my previous trailer and white on the current trailer, same layout and vent location.. Although I like the look of the black vents better (they matched the trim and A/C cover) I went with white for the new one. The reason I chose white this time is because they let in more natural light. I really missed the extra light in the trailer with the black covers.
I use a Champion 3100 Gen that rides in the back of the truck with a cable lock to a tie down point.
As far as leveling I carry a selection of various lengths of 2x6 and 1x6 to drive the trailer onto to get things close then drop the stab jacks.
