When I got my 2017 E19 the PO had provided a CA cover one size larger than the trailer shell. It covered the box, propane tanks and spare. The side excess hung on the ground and I tried to pull up with straps. I used it for 2 winters here in the PNW and found the water/snow pool in rolled excess, the zip door wasn't centred and basically a poor fitting suit. I decided to sell and bought from ETI the CA poly pro that fit the shell. Although snug it is way better for door access and no more pooling of water. I now remove the spare for storage and am covering the box/tanks with a BBQ cover. This is now my next project to replace the poor fitting bbq cover. I like the cover and bonus is solar panel charges the batteries through winter.