As was mentioned, turn off the water at the feeding faucet and turn off the propane at the tank(s) to work on it. Depending on the location of the leak you may just need an new hwh. If it is a weld or seam in the tank replace it. You may be able to bypass the hwh with the valve(s) so you can have water while you replace the heater but you would have to look at the back of the hwh.
If the outlets tripped during/after the storm what were the conditions? Rain etc.? You may have a condition with an outside outlet, cable, cord or something like that causing the gfi plug to trip and not reset - or you may need to manually do that.
Danny & Susan wife of 53 years
2019 Ram 3500 Laramie CC SB 6.4 4x4 4.10
2020 Montana High Country 331RL