The first year we owned our RVision TrailCruiser hybrid I skirted it for the winter with inexpensive chipboard, painted black. Worked just fine and had I not later sold the trailer I'd probably have used it again the following winter. No issue, no critters, no snow under the trailer. :B
2012 Silverado 1500 Crew Cab2014 Coachmen Freedom Express 192RBS2003 Fleetwood Yuma * 2008 K-Z Spree 240BH-LX
2007 TrailCruiser C21RBH * 2000 Fleetwood Santa Fe
1998 Jayco 10UD * 1969 Coleman CT380