RV Cover, Fit37'-40' Extra Tall Class "A" RV, Travel Trailer RV, Toy Hauler RV RV cover Xtra tall fit 37'-40' Xtra tall class A Rv. Dimension:486H x 105W x 126H Designed and manufactured to be the best polypropolene RV cover on the market. This triple layer cover offers outstanding protection against the elements. The cover also breathes to prevent condensation and mildew Zippered panels allow access to any part of RV when cover is on.