My 3000 is set up to run low pressure propane on a 1/4 in line. That is there is a regulator at the tank reducing the tank pressure.
I have a 3/8 hose with quick disconnects to run it on natural gas household pressure. I have not used that hose yet and got it more for the match to the quick disconnect on the house. I would think your 1/4 hose would work for both fuels.
WBCCI 12156 AIR 3144 WACHUNG TAC NJ6
2004 Excursion 4x4
1991 34 ft. Excella +220,000 miles, new laminated flooring, new upholstery, new 3200 lbs axles