Use a gas stove instead, not going to get an electric stove that runs on 110 and 15 amps.
Same with the water heater.
It would be far better to find a ref. that can run on 110 or gas.
One way to get all this stuff cheaper is check around at car junk yards and places that sell campers. Any bigger dealer will have older trade ins there parting out.
If you use all gas then you do not have to be at a camp ground to use the trailer.
You could also picked up a converter and install double bulb lights so they will run off of a battery or 110.