WHEN I get my hands on a T-3 to replace my T-1 for out-in-the-wild setups, the main options I'd pick on the order page would include: BeiDou, and UHF+LTE. In my case I'll probably add an external antenna connection, because that's just the kind of fella I am.
All the other standard/default options look pretty dandy. Fairly well-configured for use with an LS/LS+.
Side note: while looking at the T-3 configurations, I'm not mistaken it looks like there's a NEW Rugged Case (16") available too? I'd certainly like to see specs and interior pictures of that, and might just add that to my next order...