The charge is a nice way forward; however there is the possibility of electronics damage according to my dealer of power peaking during the charging process. Need to review that further if the key option below does not work out.
Yes the Range Rover is good for towing, you put a five amp fuse in slot 37 of the fuse box, turn the ignition on and the transfer case automatically switches to natural, turn off the ignition and put the auto box in Park, and then you can tow.
PS: 2006 model and newer CANNOT be towed four down; you cannot switch the transfer case to natural.
Yes the transfer case is in neutral, the only power requirement is for the Brake Buddy, and there is a 12 Volt power socket on the dash that is always hot, so no need for the key there. Think I may experiment with the idea just the key in to release the steering lock and not turned. The battery is massive so will keep the brake buddy live for tens of hours if nothing else is pulling it down.
Many thanks to the both of you for your input and suggestions.
Steve & Sue
Monty & Wills the Welsh Pembroke Corgis
2007 Cayman 36' PDQ - 2005 Range Rover