I have wintered the past two years and made a vinyl skirt, or a variety of companies can make them for you. That way it’s possible to get a neat, virtually total seal around the bottom, which is the key to skirting. Under the skirt was always 10-15 degrees warmer than ambient, and the floors warmer.
I have seen Airskirts in the Rv resort on a few rigs. They are ridiculous.
1. Ugly
2. Labor intensive to inflate and especially deflate.
3. A pain to store.
4. It’s impossible to fill all the gaps—around tires, battery box, dump valves, stab jacks—and all smaller balloons you need to fit the nooks and crannies look like crap, as does the whole installation.
Since under the trailer is not heated, having the supposed ‘insulation’ of all that air in all those balloons is unnecessary and lost anyway due to all the gaps.
Believe me, in two season I’ve seen it all and those things are a useless and expensive waste of money. You are better off using nice black tarp material or billboard vinyl (you can buy online, the back side is black) and use snaps (permanent) or colored residue-free duct tape. My neighbor did that this past season and it looked very neat and was very effective. Another advantage to skirting is you can lift the edges and store bins and things underneath. Can’t do that with airskirts.
Pics of my home made skirt below. The white clips are pvc pipe clamps that hold the skirt over pieces of 1/2 inch pvc pipe to hold it all in place in the wind. The commercially made ones that are custom measure are generally a heavier vinyl with weights integrated at the bottom. Very neat and clean whether home made or purchased custom.