Battery life

Hard to say anything about how long your battery lasts when camping because nobody knows how much you use your 12 volt stuff or how good your battery itself is (stsyle, size and condition) and all of these things are variables. I CAN tell you that ALL batteries are better off if maintained rather than depleted then recharged so for that reason it's best to recharge your battery every day. True deep cycle batteries can withstand deep discharges far better than combination batteries and even MORE difference between starting batteries and deep cycle. Even deep cycle should be discharged no more than 50% for maximum usage (talking about years not hours here). My 6 volt Trojans usually are good for around 8 years of hard use but I recharge them daily when they're in use. In order to keep ghost draw from discharging batteries all that is needed is to remove the negative line to the trailer and leave it disconnected. A more costly but ultimately more convenient way is to install an isolation switch that does the same thing as removing a cable. During summer months I could go for a week or more with no problem but I"d be paying for it in lost overall use time on the batteries so I run the charger daily unless there is some reason not to do so. Of course during cold weather camping when running the furnace then going a couple or three days is about all that is practical. Furnace blower takes a lot of power.

As for what runs on 120 volt vs 12 volt plower, if it's a 12 volt product and WILL work without you being connected to 120 volt then it runs from the battery. If it doesn't work with the RV unplugged it's 120 volt and this is ASSUMING that you don't have an inverter running.

Good luck / Skip