Thats all the fuses.
12V source starting 6V not really a problem. Like many others have said it has been done for years; trucks, cars, tractors, etc.
Best to protect things, radio off, lights off. Like others have said, don't leave jumpers hooked up once truck starts. I have experienced two near-missed, one blown coil (full of hot oil) in a combine and a blown battery (nasty acid) in a Jeep. So don't rev up vehicle you are starting from, in fact I would not have it running and start with 12.2V versus 14.4 with alternator running. 6V starter will spin real fast.
