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Actually, it is legal to tow with propane on in all states.? Its only illegal in some tunnels and on ferries. I saw a survey that said 70% of RVs tow with propane on, because its so difficult to get the fridge running on DC properly.? It may be bad for us, but its a lot worse for the big RVs which have another 20 feet of wire to get to the fridge, and have bigger fridges that draw more power.

The government also doesn't make any attempt to fix the problem.? They could require thicker power wires running through the tow vehicle, and in the bargman cable.? But they don't, and you can't even buy a bargman cable with a power wire thicker than 10 gauge.? If they had 4 gauge wire in the vehicle and the bargman, you could then easily install a 20 amp dc dc charger in the trailer and the problem would be solved.? Trailers would then probably come with a dc dc charger installed by the trailer manufacturer.

They also don't regulate how the propane excess flow shutoff works either.? It also has gotten less effective in the last 5 years too.? It used to be that when the propane shutoff engages, the amount of propane coming out would be only enough to barely light a stove burner.? But when I replaced my propane pigtails last time, I noticed that after the shutoff engaged, the burner still burned as if on its highest setting.?

Its also much more difficult to get the excess flow shutoff to engage.? My old pigtails would engage the shutoff if the flow was at the max output by the regulator.? My new pigtails would not shutoff with max regulator output.? So the excess flow shutoff now only works if you cut the propane line between the tank and the regulator -- in other words, if the pigtail is cut.??

I found this out when I tried to find pigtails with a lower max flow shutoff.? I called around asking for better pigtails, and I finally got connected to a guy that knew about propane, and he said nope, they don't shutoff at the max flow supplied by the typical regulator.? Again, this is another area where the government could impose standards that make the excess flow engage with less than max flow put out by the regulator, but they don't.??

I also looked into putting in thicker wires, and tried to find waterproof connectors, so I could disconnect these thicker wires when the trailer wasn't hitched.? I could not find anybody that had waterproof connectors.? One guy had a picture of his setup on his truck, and was using Anderson connectors that are not waterproof.? The connection point was behind the rear wheel, where it would get blasted from tire spray in rain.? Not very impressive.? The fact that I couldn't find good examples of this must mean very few are doing it.

So I'm towing with the fridge running on propane, like most others.