Do you have a inverter? Did you recently plug in a electric heater? You might want to mark all of the 'dead' plugs, and not plug in a electric heater to any that are fed from a inverter circuit. It tends to overload the inverter output circuit breaker, then you have to find the inverter and reset the CB there.
Now you have to look for the inverter and reset any output breaker on it.
Also check for any tripped GFI's - it might be in the kitchen, living room, bathroom, or even a basement storage compartment.
Before spending all the fuel and time to take it to the dealership, call and ask where to find the inverter and GFI's. Or stop by the dealership and explain your problem. They might have the same layout as yours is on the lot, and can show you where to find all the GFI's and inverter re-sets.
If you have a fused inverter output, and tripped a internal fuse, you might still need to take the RV into the dealership, and have someone find the inverter, take off the front cover, and replace a bad fuse.
Good luck!
Fred.