New 177 tow and storage questions

We've closed on our 177 and will pick it up in June in MI and head to the west coast.  Tow vehicle will be a 2007 BMW X3.  Have had UHaul install a hitch.  Wondering if any of you have installed your own Brake Controller.  Also, have you done anything extra for your side mirrors on the X3?    Also wondering how the BMW X3 does as a tow vehicle.  Do we need to higher terrain and mountains or does it pull like a champ?    

We just got our 177.  IFRR, there is storage under one dining seat.  The other is closed and has electronics or something.  I'm told that you can open it up and with a little carpentry get some more storage.  We had uhaul install hitch and controller.  I'd have done both, but we wanted it quickly.  I'd have puttered.  The controller would be easy to install, I think.

There is also some room under the bed. We just use a plastic tub for clothing there.
We bought our 2011 177 used last summer and the previous owner had screwed a plastic bin to the floor under the drivers side dinette seat so things wouldn't wander around into the charger/fuse box and such. He also put hinges on the compartment cover for easy access. We put things in there that we don't us much or hopefully only for emergencies. 

Make sure you seal it up well before you float it for the first time, and get the outboard motor attachment for the rear receiver...

Well it is raining...