Yep - flatly refusing to cover our battery under warranty was the nail in the coffin for our local dealer - we will only go near them for recalls and such - other work and servicing will go to a local non dealer workshop that specialises in Jeep.
Our TH is booked at the dealer for S55 (and assessment for the Rear Drive module noise - which they've been asked to look at the last 2 times its been in there - 3rd time the charm?) this Thursday.
Edit with update: the S55 recall for us only involved a flash to latest software (no fault codes for the loom issue) - which they evidently got right because our Trailhawk is like a new car - transmission is behaving very much like any normal automatic now. I asked them AGAIN to also address the RDM bulletin and they did! - subsequently we also had the DTCM replaced and flashed - so no more high pitched noise