Let me see if I can make this short and simple..... nope! lmao.
When you are in a campsite with electrical hook ups and you get your pup all set up, you can in fact do all that you mentioned, because your trailer will run on the electricity provided.
So what do you need a battery for? Most of the systems in your trailer are made to run on 12 volts. Therefore your trailer can run most things on the battery (lights, water pump, heater fan, etc.). Some of the systems in the trailer require the standard 110/120v electricity (TV, microwave (if equipped) etc.). Your trailer also has a converter so that when you are plugged into electricity, the 110/120v is converted to run the 12 volt items and also charge your battery. Yet, when you are camping at a site without electrical hookups you can still enjoy many of the amenities because the battery will power the lights and all other 12volt systems. Keep in mind though, when running on battery, it is a BATTERY and leaving lights on is bad. Running things like the heater fan will drain the battery very quick. Also, if your trailer is equipped with a CO2 and/or smoke detector, that is a constant parasitic drain on the battery when not hooked up.
Finally, if your trailer has trailer brakes (most PUPs don't) like the bigger trailers, you have to have a battery to power the emergency break away which engages the brakes on the trailer in case of separation from the tow vehicle.
Feel free to ask any other questions. There are a lot of people here who are very knowledgable and a wealth of experience. Don't feel that any question may be too simple or stupid; there is no such thing. Just keep in mind some of us here are hopeless sarcastic smart a$$'s.
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