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Grumpy_G said:

Here's a video on the AL-KO surge brakes, can any of the early Dutchmen T@b owners confirm that's what they have ? https://www.youtube.com/watch?v=CwYRgFA2vBc

That looks like a similar mechanism but much larger diameter than the model used on the DM T@Bs
The DM surge brakes do not require a pin to back-up.
From the look of the position of the hand brake handle in the OP's photo, the brakes are in need of adjustment.  There are maintenance and adjustment manuals in the files here.

No, it doesn't matter if the 12V supply comes from the converter or a battery. Given that the interior lights work at least part of the 12V system is working. Next step would be to check the DC fuse for the fridge. 

That should work. Not to offend you, but as you just got the trailer are you familiar with absorption fridges and how they differ from residential fridges ? Absorption fridges take a long time to cool down. 

Thanks to the power of the Internet I learned the buttons are purely mechanical and don't need 12V power to function. When you switch it to gas, do you hear a "tick, tick, tick, tick, tick" from the relighter ? When you turn it to DC, does the fan in the power distribution box come on ? 

Here's a video on the AL-KO surge brakes, can any of the early Dutchmen T@b owners confirm that's what they have ? https://www.youtube.com/watch?v=CwYRgFA2vBc

As for the fridge, it does need 12V to operate on propane or DC (obviously, doh!). I *believe* the early style (push buttons for mode selection) also need it for AC operation. Hooking up to shore power should provide 12V power via the converter which should make all three modes work unless there is something wrong on the power side. 

Troubleshooting steps: Trailer connected to shore power, do the 120V AC power outlets work ? If not, check breakers in the power distribution. Do 12V interior lights work ? If not, double check breaker for the converter, then DC fuses.