go to ebay and search 50 amp cord, and how big is your box?
once the cord is hooked up, then you can add extra breakers and outlets to your hearts desire
problem is when people do 30 amp or less they do not have enough wire and outlets etc to take advantage of the extra power w/o going behind walls or bulkheads
example in LaTortuga
we wanted to be able to cook and sleep in comfort
so the bus is divided into two regions front and back
on 15 amp 120, we can EITHER run the bedroom AC or heat (back) or
use the 2 electric burners/Rotisserie oven in kitchen (front) we can only use 1 and keep fridge going...
one 1200/1500W heater or AC front or back or we can cook 1400/1500W
on 30 amp we have 15 amps available in the front AND the back, so bedroom ac/heater on and at the same time; we can either cook OR run the heater/AC (fridge stays on)
now with 50 amps we can do whatever we want 2 heaters/AC and cook with rotisserie(1500W and two 700W burners etc) and heat the 40 gallon water heater with 220V also
so you can see how it stacks up if you run wires with a purpose
Now your thinking what outlets work with what cord?
Using adapters from 50->30->15 amp...all circuits will be energized...you just have to be mindful of counting amps or you can trip breakers (heater on in back and you turn microwave on to heat coffee...15 amp breaker that we are plugged into will go..CLICK
hope that is clear as not really dirty water