Our 2400W is also on order as well so I can only answer based on the research I've done so far on those same issues.
When reading the Sprinter manual the instructions for without
steering wheel controls apply to the chassis as FR orders it. Since the OEM TPMS requires those steering wheel button to function we do not get the TPMS. I'm looking at the aftermarket TPMS options now as well as steel valve stems to install the tire senders on the wheels.
There is not a built in electric brake controller. Nor is the chassis pre-wired for a brake controller from the M-B factory based on what I've found out. From everything I've read installing one can be a real bear due to the M-B Can-Bus electronics. To avoid some of the installation hassles I'm looking at the Prodigy RF shown Here
. We may just skip on towing altogether as the MBS isn't that much bigger than the F250 Crew Cab pickups or Expedition I used as a daily driver and to tow our travel trailers
When is your "due date"? We are looking at mid-August early September since we ordered full body paint....