Best, strongest and fully towable covers ......see Garry who is an absolute grump but a bloody good tradesman  

 Justin at Polyfusion in Carlisle made mine. Ultra tough and very good quality.

 Thanks Sunshine and Sea-kem will touch base with them.

Much appreciated.

 Last one I bout was off Ebay for a $120. Same boat Cruise craft 575

Also got mine from eBay from Kaiser. Seems to be ok, not a snug fit like the custom ones but then I paid 10% of the price. 
it says suitable for towing but I wouldn't...

cruisecraft 625. 

 I got one off eBay.  Mine is meant to be trailerable, but I'm never going to do that...it's just for parking cover.

https://www.ebay.com.au/itm/Heavy-Duty-5-2m-5-8m-Trailerable-Jumbo-Boat-Cover-Oceansouth/262505853665?epid=14011075135&hash=item3d1e9172e1:g:ZuwAAOSw~WpeTcO9

They are well built

have the jumbo size for my Trailcraft.   Bought from Whitworths.  Water repellant and keeps UV rays away.   My experience they last about 5 years in the open but do the trick well.   As above, wouldn't try trailering it but perfect for parking cover

I purchased a Kaiser for my 625 cruisecraft for under $200.00. As Grumpy said, they say it is suitable for towing however i wouldnt either.

The cover ripped in half with the crap weather we had in early May. The cover was 11 months old and they claimed a to have a 12 month warranty so i contacted them to enquire about. I sent them a photo and they claimed that the pvc pipe i had in the rocket launcher was most likely the cause of the cover tearing (I dont agree with that) however without argument said they would replace. About a week later the new cover arrived.

Most likley they are generic ex-China or somewhere, as a mate has the identical cover yet with a different brand name.

May not be as good as a custon cover, but does the job for now and I certainly cant complain about Kaiser Boating for their after sales service. Certainly would recomemnd Kaiser Boating.

 I currently use a Kaiser bought online for a 5.2m centre console. Fit only just OK, mainly because I have a custom fold-down canopy that is higher at the stern when folded, so raises that end of the cover up. I would not use it when towing on a trip, given the marginal fit ovrall, but fine for keeping the sun off and leave out when parked outside. I had  similar one from Whitworths before, whcih survived fine on a trip to Coral Bay years ago, and a 20' grey tarp from Bunnings before that. Seem to get around 4-5 years out of any of them, before  rips and leaks become an issue, so at around $150-200 each, maybe under $500 for about a decade of cover of the boat in the yard. However, if I wanted a perfect fit, something for cover during highway trips up north and overall superioir materials  etc, the custom is something I'd definetly  consider. In fact I am. With custom you can get nice extra features built in like breather vents, extra tie down points etc, but you pay of course.

 Cheer Guys

Appreciate all the feedback. Good to get some feedback from the end users rather than the salesman at the stores.

Thanks 

Anchorman