Originally Posted by urocav2001
Ok I will be dry camping for 3 days, using fridge on propane and a few LED lights before bed, that's about it, we just have 1 battery that came with the unit, and the generator is fairly small
These are modest demands and it should not take much. As noted already power the 110V portion of the RV from the generator and let your RV converter do the battery charging.
It is entirely correct that we cannot tell you what it will take in time. This will even vary for you from one trip to the next. This is why having measurement devices is key. A prior poster gave you an example of a simple plug in voltage measurement device and a battery charge level table. Start with something like this and monitor where things go. If the voltage does not drop much you can run the generator less or vice versa.
The next step up in monitoring is to add a meter which measures both voltage and current. This will enable you to have an idea how much power your devices use and you can use that knowledge to build a power budget or manage use patterns. There are much more expensive and capable versions out there but I put one of these in my Rockwood: bayite DC 6.5-100V 0-100A LCD Display Digital Current Voltage
. This meter also tracks power usage over time. The biggest limitation is it only tracks current out and not in so you cannot measure charging power.
Adding heater use to your scenario will be the next step up in consumption as the blower will pull 4-5 amps whenever it is on.
In my TT during summer we survived a few days of boondocking just great with a single basic group 24 12V battery and a 100W solar panel. Refridgerator, water pump, LED lights, and the background draws. I think in winter I would need to add a second battery and jump to 200W of solar to handle the addition of the heater.