Most likely you have a GFCI outlet tripped. Many campers have one near a sink, but possibly one in both the kitchen and bathroom.....sometimes you can find them in storage compartments/pass thrus.
If the GFCI trips, then all the rest of the outlets are wired in series downstream from the GFCI and also will not have power.
Find any GFCI outlet (you will have at least one, maybe more), and press the reset in it and see if this solves your problem. This is a very common problem too, with the GFCI either being tripped, bad, or a loose wire inside.
This schematic shows how the slave outlets are wired in series to the GFCI master outlet. You can also use this to test and see if 120 volt power is reaching the GFCI, then passing thru to the other outlets.