Those are typically two different styles of covers because of the way it tightens down. On the trailer, you can use straps to the trailer. But obviously you can't do that when in the water. So things have to be done a little different. Most go with a cockpit cover around the glass and the helm seating area. But to cover the entire boat you're definitely looking at talking with a local upholsterer/canvas maker to make something that suits you since you won't find it "off the shelf". Consider putting a ratchet strap in the hem, which would go just under the rubrail.