The Adco SFS AquaShed Cover part # 290-52238 and Adco Polypropylene Storage Lot Cover part # 290-74838 are both great options for a 2017 Jayco Jay Flight SLX 145RB. The Polypropylene is more heavy duty so it should last longer but it will also be more difficult to take on and off so it really just comes down to how long the trailer will be in storage and how many times you'll need to install and remove the cover. view full answer...