I have a 2015 GH 31FS. I bought an empire cover and it's fantastic.
Empire Cover Premier Class C RV Cover, Size RVC-E which is the 31-33' model. Make sure you get it at 45% off, otherwise you are paying too much. Should run you around $430. Worth it.
2015 Jayco Greyhawk 31FS-"Scamper"
2015 Subaru Forester 2.5i Prem. 6 Spd
Blue Ox Aventa LX Tow Bar
2014 Jayco Jay Feather X23B-"Glampy"(Sold)
DW, DS, DDx2, and Bandit & Fletcher