List of Accessories, what I got so far...

Thanks for sharing your list.
On the things you are thinking of getting, my top choices would be a refrigerator/freezer like the Norcold 30, A lithium battery like the brand you mention and a generator.
I think I would stay away from a 12-volt heater, as they consume too much energy. A small 360 watt one would pull in the range of 30 amps (12 volt). On a cold night/morning, you would likely burn through your full battery capacity. As a comparison, a Norcold NRF-30 uses around 4.3 amps.
If you were to get a lithium battery, you may wish/need to consider a solar panel with a controller. The need for another solar panel would depend on the type of camping you do and if your current 100-watt panel for your Jackery could be adapted for your trailer. (You should be able to add a controller for <$55) If your camping is without shore power for multiple days in a row a passive method of recharging your trailer battery with a solar panel is better in my mind than running a generator or your vehicle for recharge purposes.
As for a generator, take a look at what accessories you want to power at the same time. For me it is really just the AC unit. (I have a 5-wide with no microwave). My AC pulls a little less than 500 watts (110-volt). The converter pulls another 15 watts. My generator is a propane powered 700/900 watt unit. It does the trick, but a little more would allow for some more breathing room. You may be able to get by with a 1,400 watt generator. The difference using Predator as an example, could save $150 and reduce the weight from 49lbs. to 33lbs.
Happy camping, and once again thanks for your listing along with the appropriate links. Good Job!
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Thanks for the very helpful list of accessories! I just bought a TAG 2022 with the boondock and convenience packages and am getting accessories. Here are a few notes:

1. This might be better option for a refrigerator: ACOPower LiONCooler 42 Qt. Battery Powered Portable Chest Fridge Freezer with 10+ Hour Run Time and DC/AC Solar Panel. At least, I'm considering it.
2. I just bought this wheel lock: Trimax TCL75 Deluxe Universal Wheel Chock Lock-Yellow/Red.
3. I substituted this battery for the one that would have been supplied by NuCamp.: Renogy Deep Cycle AGM 12 Volt 100Ah Battery w/Box.

I just bought a 2020 Boondock Edge, and installed a BougeRV 28 L fridge/freezer. Love it! Lightweight, and since I live in TX, a cooler doesn't cut it for perishables. I'll mostly stay at electric sites until cooler weather. TY for your list!