Was gonna say be done with it and get a 3/4 ton or bigger.
IMO half ton is a half ton. You're not moving up in the world much by getting a turbo 6 banger gasser to replace your turbo 6 banger diesel.
Don't sell the Eco D short and regardless of final gearing, the wide torque band and 8 forward speeds makes up for most of any rear gear shortfalls.
But if 30' was cramped then you're pushing yourself into campers that will be a bit of a chore behind a half ton.
Depends on your use. Several short weekend trips or X country, mountains, lots of miles with the trailer hooked up matters IMO.