Yes on the skirting and a must is to put heat rap round the water lines ,a heat source in the under belly storage area and I would also put some sort of blanket around the propane tanks to keep them warm to,I am sure someone else who does more winter camping in the cold on here will chime in.Most of our winter camping consist of move the camper to warmer weather
I wish you luck .
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2008 F350 chipped and bagged 6.4 power stroke crew cab 4x4.2013 384pk Raptor (Gravy Train) 2006 Fatboy w/18inch ape hangers,2006 883c sporty,Army wife Kim,Cocoa (The Boarder Collie) and Rebel (The English Bulldog)
(THE RICH RAGE WAR,BUT ITS THE POOR THAT DIE)