I don't see that offered online at Austin,at least not on their regular web site catalog..
Click the "Contact Us" link on AUSTIN KAYAK's
site, then ask them for a quote for Hobie Part #38652001.
They will then send you a reply with the price and a customized link that will allow you to order it. This is the same for any Hobie part that they don't list on their site.
I can find a Trailex 350 S a few places. What modifications would I have to make to that ?THIS POST
details some modifications that sun E sailor has made to his Trailex 350.
There is also an issue with chafing between the hull and amas while trailering. Some fixes are offered HERE
The only think I can think of that you would have
to do is purchase the Hobie TI cradles. SES and I opted for three cradles instead of two which requires and extra crossmember and fittings. If you are happy with two cradles, the Hobie offering is probably cheaper than purchasing a 350 and the cradle set.
The Hobie 350 was not available when we put these trailers together. One may be able to get the extra crossmember from Trailex if you wanted to add a third cradle to it.
Edit: Just remembered, you also would need new crossmembers as the TI cradles will NOT work on the crossmembers that come with a Trailex 350.