I keep looking at this photo, with the bulb solidly on a trailer crossmember, the hull effectively sprung on tyres, strapped down hard onto keel, 2300km between Pt Lincoln and the Gold Coast, the keel joint to the hull is going to have a very hard time.
If the hull wasn't buggered before that ride home might finish it off.

minis are often canting keels, but in older vers can be fixed