Cost of skirting is all over the place.
For white vinyl, which I’d say is the standard in a lot of places, you’re looking at anywhere between 1500-4000. This is depending on 1) Material cost (are you providing it or are they? If you do it’s cheaper usually). 2) Labor cost (You want the contractor who isn’t the cheapest, there’s a reason they aren’t busy. But one who isn’t trying to pull one on you. Get the guy in middle who’s fair pricing, good work. Shoddy work is the worst…
This is just for skirting, no siding, but always ask on that as well. Sometimes you can get a discount.
I just had someone quote me skirting, with timber under to prevent weed eaters to knock it off, for 1,500 material included. Good pricing is out there but it’s the 10th guy I called and got this as a recommendation from other park owners (also a good source to ask around!).