I put the mast down, use it as a ridge pole, and cover the boat with a tarp.  I don't use any additional structure for support.  The tarp is attached to the trailer using every grommet to keep it tight and spread the load.  Cost is in the low three figures.

Peter Nyberg
Coventry, CT
s/v Silverheels (1988,2016)

> On 2023-12-03, at 21:01:48 EST, Mark Whipple wrote:
>
> I'm not sure how far they service beyond New England, but in Boston it's common 
> to see custom boat covers by these guys in New Haven, CT: <a 
> href="https://fairclough.com/">https://fairclough.com/</a>  Expect to pay them 
> well into four figures. 
> 
> Mark Whipple
> 
> 2000 R22 *When and If*
> Boston, MA
> 
>