Main gas line problem

When at the camground I was sitting and noticed a line looping low below the gas tanks on my 2619 hitch. Yup it was the gas main and had been scrapped badly by the road. It is abraided for about a 1 1/2 - 2 inch length.
Has anyone ever had these repaired? Or does the whole line need to be replaced( that looks expensive). If repair is possible do we need to take it to a Trailmanor dealer or just to a propane expert.
Honestly last year we turned on the gas to check the stove after we bought the unit, haven't needed it since, but we are heading north in a couple of weeks and may need gas heater.

Thanks Janet and George.