thats going to make a big difference in comfort.
a lot of the draft comes in between where the skirting stops and where the trailer begins. at that joint. so you need something there from what i am learning from my own situation.
cant tell from your photo, but you have to make sure the junctions between where the where that piece of trim is attached (top and bottom) is properly flashed or otherwise it acts as a siphon for water to enter the crawlspace when it rains (or daily dew formation). also have to make sure that belly board or thick tarp at the bottom of the mobile home where it is attached to the sides (next to the skirting) is good and secure with no holes or else the water hitches a ride straight into the belly causing extensive wood rot. great if you have all that taken care of, but adding this to let other folks know. its discouraging as heck to do all that work and then later on realize you caused more trouble than had you just not done any of it. (ask me , for i know this personally, i could write a book on dumb stuff u should not do to your home) :facepalm: