Hi.
I am sorry I didn't pick up on this one earlier.
I have a T4 which I use at home and a 970 which travels in our RV - We have just come back from 7 months in Portugal to the UK. The 970 travels in a "Stag" padded bag on the spare bed (drop down bed at the front) and gets plenty of hammer (from me when playing "Rock" numbers
).
As we are often off grid I use a 12 to 19 volt converter to power the board with no problems at all - All I did was cut off the cable from the mains adaptor out and replace it with an inline 12 volt socket for use when mains power is available and put an inline 12 volt plug on the lead to the keyboard (I put an inline 12 volt socket on the 19 volt adaptor too).
Now I can play from mains power, 12 volt from the RV and from a 12 volt battery if I want to play outside. I have started more than the odd couple of parties just by playing outside - people just come and join in.
Most of my T4 styles and MFD's are OK with the 970 with just a few requiring changes for voices not in the 970.
I realise I am a little late but I hope this helps inform your decision.
Cheers