Just back from Germany,where I saw a new mobile studio,being used for the first time.The trailer,while 13.6M long has pullout sides,and is modular inside.At first glance it looks like an F1 hospitality trailer.Some of it's features:
On board power(silenced) with long leads for outside shooting.On board water,gas etc.Battery charging,with standby batteries fitted.
Fully stabilised trailer with hydraulic jacks
Internal modular design,allowing for various sizes of set etc
Bar/shower/conference area(doubles as dressing room as required)
Excellent comms including VSAT satellite coms with usual cellular etc(complete with pump up mast for difficult GSM areas)
Full suite of IT equipment,including one of the best edit suits I have seen.
Roof are on top of the trailer for shoots.
There's a separate smaller trailer for overnight accomodation etc.Enough for crew models etc.
It can be hired on a daily basis.It's not cheap.but seems to have many possibilities.