Happy ending to what otherwise could have been a disaster and costly incident,
I've seen similar, A friend and his family invited my family out to a day on the lake in his new 21ft bayliner, we met at the boat launching ramps, which was down hill grade from the roadway,
We enjoyed the day and loaded the boat onto it's trailer, off he went with me fallowing, the road was curvy and with low shoulder on our side, This time he was pulling up hill when My friend found out the hard way,
( that not all trailers fallow the path of the towing vehicle) especially a wide trailer....
The trailer passenger side wheel dropped off the shoulder and the weight of the boat shift to that side, resulting in it sliding against a large pine tree that stood 4 ft off the roadway, it was the tree that kept the boat from sliding on down the hillside, My friend had a wrecker to pull it out, we notice many of the trees along the roadside had marks on them, so he didn't fill so bad,
A couple weeks later He had the boat on a tandem axle trailer, This particular boat ramp was the closest to his home and he planed to use it frequently and said he felt better knowing he has 4 wheels planted on the road rather than 2,
I tend to agree