Your little "fuses" are for running those items in your RV on 12 volt DC (your battery). Pulling them will make no difference on your electric bill.
Now, flipping your breakers, that's turning off circuits for your 110 volt AC power (like Air Conditioner, outlet plugs, microwave, and any other appliance you have plugged in). I wouldn't think flipping the breaker would make that much difference. Maybe a penny or two a year over the next million years may make a difference, but in the short term (say, less than 10,000 years), it probably won't make any difference.
More than likely, the breakers inside your camper are only 15 amp. Basically, you can run only one 1500 watt item on a circuit (along with some other things), and that's about all.