The current standard cover for Moomba is, as you say, a cover for when the boat is sitting on a trailor or when moored (including at the dock) but not for use when trailoring. They are canvas and black rather than a "sunbrella" material and periodically they must be re-waterproofed. Thompson's Water Seal (yeah ... the stuff used for wood decks) is an inexpensive option to waterproof but I usually suggest that an inconspicuous spot be tested before applying to the whole cover. You also need some support poles inside to keep water from collecting (standard with new covers).

Another option is to get a cockpit cover and a tonneau. These are tighter and snap on but I think the support poles are still required. Again, if purchased from Moomba they are canvas and black.

I have the standard mooring cover but right now store my boat in a shed so don't use it. I have a slip dock ordered and so will need to use a cover soon.

I checked with a local canvas shop on the price for a cockpit cover and tonneau made from sunbrella for my Outback and the price was more or less comparable to the cost of the Moomba cover and I think sunbrella will protect the boat better.

For you, the standard Moomba covers could fit but I suspect that after 10 years the local canvas shop may be your only option. Especially if using sunbrella, be sure the covers include vents.

Richard