MasterChief

Hi
I am new to the MV world. Any help would be appreciated.
I want to use 12v accessories ( scanner, radio, aux. lights like bed lights, fog lights ) on the 24v system of a M-35.
Trialers - I figure I will just swap bulbs - simple is good.
If I ever need a jump I figure I can use a 12v car and charge each battery for a few minutes then disconnect before cranking.
If I need to provide a jump I would just turn the truck off and jump the needy car off one of my batteries.
I've got a lot figured out - ( i think?)
EXCEPT - running 12v accessories off my 24v system............ I see my needs as twofold: a) a high draw 12v source for lights. and
b) a lower draw 12v source for electronics.
Comments? suggestions? ideas?

Thank you!