My former '94 Bronco had a similar problem. Had the front to back line go...while towing the trailer. I used the trailer brakes and managed to limp to a garage.

I was about 50 miles from home to go the Mopar Atlantic Nationals with my '72 Plymouth. I found a local garage willing to do th repair while I was at the show. I drove my Plymouth to the show and left the truck for the fix.

The rest of the lines showed no serious rust issues, and it was find until I sold it.

I guess I was in some ways fortunate to have the trailer with me for it's brakes...but it got lots of brake fluid on it.