That mod likely won't be very focused on drivetrains anymore, since the T-Series now has twinsteer and tridrive. And so far Epicfacecanada hasn't given any hints that he'll continue to develop the mod in its old direction, that I know of.
.. But didn't he just make a post yesterday about talking about very said drivetrains, not to mention having already released a couple for the MD Series?
But that doesn't confirm that he's going to stop working on them at all. He hasn't explicitly stated otherwise. More to the point, he even mentions that he's going to rework the AWD differentials with the now vanilla twin-steer axles soon. Just because something got implemented officially doesn't mean that it's the "end all, be all" for mods.
Close, but I initially thought that there should've been more upfit lengths, but to my surprise there wasn't so I made more upfit lengths with a new Short Upfit Frame.
Not really. However, I feel confident that there will be a Tandem Axle configuration for it in a future update