When you can run a generator, plug the trailer into it and you will have charging and/or run your appliances. Should a appliance be too much while you are charging, turn the breaker off to the converter while you use the appliance.
So you should have no issues with the coffee maker or hair dryer.
Now if you use a auto drip and don't want to use the generator, put the filter and coffee in, heat the water on the stove and pour it over the grounds. It's the same as the cone filter we used for 25 years.
Now if you like dry camping, there are many ways to make it so you don't have to have the generator or use your rig like a tent. We only dry camp, haven't run a generator in a few years and still use a auto drip coffee maker, the microwave, a hair dryer, ect. We do it with a solar system, extra battery and a inverter. Next year we will even have a 5000 btu A/C that will run off of the solar.
I don't suggest it for the occasional dry camper, it's too involved for that. Just saying that you don't have to run your trailer like a tent just because it's not plugged in.
The other side of dry camping is frsh water and waste tanks. How are you set up for that?