You might want to check out
Boat Tailors too. They are now a sponsor on Triumphowners.net and make great custom trailerable covers for Triumph and many other boats. I had them make a custom cover for my 2006 215 Chaos and it is awesome. It was more expensive than many recommended here but should last well over 10 years and I couldn't be happier. Check the photos of my cover in this thread:
On a positive note!
Eric at Boat Tailors in Reidsville, NC now has the pattern for the 215 and is adding more patterns as needed for Triumph boats. They also make t-top canvas, etc. Good folks that do quality work!