Cut the line. Just make sure you get a flared connector, approved for gas, to put it back together. Don't cut directly under the axle but off to one side. This will leave the longer piece of piping as the only side you will have to bend.
If there is enough room above the axle tube you may want to install the pipe above the axle to correct the mistake they made at the factory.
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