Yet another option, which is what I did in addition to running the larger gauge wire between the battery and fridge, is install a DC-DC battery charger in the TM near the battery. This device draws more current from the TV, and then bumps up the voltage to be delivered to the TM battery. They come with various capacities, and since you don't want to draw too much current over than long run and max out that circuit, you need to select one of appropriate size. What I did was look at what the fuse rating of that circuit is under the hood of the TM, and then select the charger such that the input current would not exceed that rating. If I recall, that current rating was 20A.
I bought one by the Australian manufacturer Redarc, because that was the only one I could find at the time. I think it was this one:
https://redarcelectronics.com/produc...attery-charger
But Renogy has since gotten into the market, and they sell what appears to do the same thing (though I have not explored it in detail) for a fraction of the price, probably a benefit of being made in China. See:
https://www.amazon.com/Renogy-Batter.../dp/B07Q5VYPCF
At least in my case, this delivers adequate current to the TM batteries while running the fridge on DC, and also delivers a small charge on top of that. If the fridge were off, it would deliver a significant charge.
Dave