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rfuss928 said:

I guess my trailer became my power station - at least for our compressor cooler...

We've followed some similar methods for powering a 12V chest fridge. Our old Wrangler doesn't have an inverter or a DC-DC charger, but while driving I'd plug into a cigarette port in the tow vehicle. Like you, we now have plenty of solar and battery capacity in the T@B. For a while, I was running a wire from a port on the trailer's tongue box into our Jeep. Once setup, we'd keep the freezer outside the trailer so that we could take day trips. The part I didn't like was having to move the chest around. That included putting it inside the door of our 320 when away from the campsite or back into the Jeep at night time because of critter worries. 

With this new setup, the plan is to leave the cooler in the Jeep all the time. Since it's used as a freezer, we don't need to access it too often. An additional benefit is having ice for drinks when away from the campsite on day trips. If I hadn't already had most of what I needed for the project, I probably would have stuck with what you're doing, but have high hopes that it will serve us well.

We.ve been carrying a compressor cooler for many years and used a small lunch box size "solar generator" to keep it going in the TV when overnighting.  I would recharge it generally from the inverter outlet in the TV while traveling.  Usually while traveling we didn't worry about powering the cooler during stops.
When I installed the 200 AH lithium batteries in the trailer I found it more convenient and reliable to plug the cooler into the 12 volt SAE connection in the trailers tongue box when overnighting.  After a bit of thought, I decided to just leave the cooler plugged into the trailer all the time. Now it's powered 100% of the time no longer dependent on the TV running and it remains connected to and left with the trailer once settled at a campsite. The trailer batteries are kept charged by 267 watts of roof solar along with a TV powered DC to DC charger while traveling and the trailers converter once on shore power.
I guess my trailer became my power station - at least for our compressor cooler...

I did a similar but much lazier version of this. I upgraded our 100ah Battleborn to a 230ah LiTime.  I purchased a trolling motor battery box for the Battleborn that has a 12v plug and USB A and C inputs.   I only use this battery to run the 12v fridge so no inverter needed.  I haven't bothered with a portable solar panel as of yet.  Our truck has a 400 watt inverter, so I use a 5 amp lithium charger while driving to charge the battery.