Your assumptions are correct, both the brakes and the brake / parking & signal lights will not work.
The commercial plug is different than an RV plug, as well as the lighting systems being different.
A few miles might be worth the risk, but several hours on the road is too far in my view to tow without brakes & lights.
In order to make everything work, quite a bit of time / effort/ parts will be needed.
JMHO,
RL
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2007 Carriage ROYALS INTERNATIONAL MONARCH 38
no truck yet…but looking
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