Do a quick search on axel lift. There was a long thread recently.
The few people that had lifted their TT was happy with the results.
They referred you to Dexter, so you may want to give them a call and make sure this is for your TT.
Service@Jayco.com can tell you what axel you have if need be.
I want to do the same thing, but it will have to be next year before I get to it.
Best regards,
Doug