Wow, this is cool Paul.....good to see someone building a JET! Great trailer, great manufacturer, and simple but tough design.
Used to work for the #1 seller of JET trailers (at least grain hoppers anyhow) in North America. The red T600 they had to haul their trailers around to the dealerships would roll into the yard about twice a week from Humboldt, IA.
Guys can have their Wilsons and Easts......product design on both sucks, especially from a service standpoint. No easy access to anything....airbags, thrust washers, shocks, air fittings.
Wow, anyway getting back to your project!

Looks like a neat build to keep an eye on bud!
-Alex