No electricity in RV

YOu have two power systems in the RV, 12 volt (Really 13.6) and 120 VAC.

Are BOTH systems down? or just one, if so which one

12 volt runs lights, Water pump, Furnace, Slides and jacks, and control power to Water Heater, Fridge and A/Cs (in most cases, nto all)
120 volt runs A/C.s Electric side of water heater and fridge, Microwave and TVs.

Some RV's have a 3rd (inverter) systrem, this is where 12 volts run 120 volt ac devices (usually just the TV but mine also runs the Microwave)

OFten, as you comn off the battery, there is a fuse or circuit breaker (Required in fact) this fuse or breaker may be a bit hard to find, if a breaker may be self-resetting or manual reset. Follow the wires. (Assuming it is the `12 volt system out of comission).

Start at the pedestal, power? If no, you have your problem.

If yes, check both sides of the RV's main breaker, one side should have power. If no, the problem is the cord/connections between it and the pedestal.

If yes, the other side should have power. If no, the breaker is bad.

If yes, keep going down the line checking every connection until you find where you have no power. The problem is between the last "power yes" and the first "power no."

LP fridge still needs 12v from battery/converter to power the controls

sounds like something in the power control center
a loose connection on the 120v input power ?

rewiring for the fridge is going to depend on what wires burned and why
and how hard to pull new DC power wires from the power center to the fridge