I should say right off...I've tried poly and canvas duck.

I'd prefer to not buy a tarp but rather the material and make it.

The purpose of the tarp is to cover boat and trailer for winter storage
outdoors in a northern marine environment.

Given that, what would be suitable material considering cost,
durability, and protection of stored boat and trailer ?

Vendor recommendations would also be appreciated.

Thank you for suggestions,

Courtney