If I wasn't hurt but my tug and trailer was unusable due to wreck damage or major mechanical failure far from home and my insurance company wouldn't help, I'd buy a cheap car or truck and leave the damaged tug and/or trailer behind.
I've been in an almost that bad of a situation. My transmission in my tug went out 4 hours from home. I caught a ride with a friend home, and took another vehicle up to bring my camper home. The next day I hired a tow truck to bring the tug home. It was a $500 tow bill! (Ugh!).