We have a 3008W and I ordered a cover from CalMark. We are currently under cover for our second winter. It's a little pricey but it has a 6 year warranty. Once you contact them they will send you a package with a sample of the material, warranty info plus a generic page for exact measurements. I added my own drawing (top view) where I gave them more detail as to the nose of the trailer. Our cover fits great and I would do it all over again.
Randy and Patty
2015 Sabre 33 CKTS-6 Platinum Edition
Reese 16K Slider hitch
2014 Ram 2500HD Crew Cab 6.7 Cummins Diesel