I don't know Florida law but, under California law, and assuming this was a commercial truck, the driver was obligated to come to a complete stop at the crossing. After assuring that the crossing was clear of oncoming trains, he could then proceed. Most states have similar laws for commercial vehicles. Assuming he came to a complete stop but there was still a view block in the form of foliage, he might have a case. I somehow doubt that he came to a complete stop. I suspect he just barreled across a crossing he'd crossed many times before but this time he didn't beat the train.
Between the horns and lights on a locomotive, they are hard to miss if you are looking for one. The reason why the Supreme Court made its ruling in 1909 was that right of way had not been established in case law and everyone who got hit by a train (or their survivors) sued the railroad. The latest figure I have show that there are 248,000 grade crossings in the US and, of that total, only about 57,000 are protected by lights and/or gates. There is zero chance that grade crossing will ever be eliminated in this country. A concerted campaign by law enforcement nationwide to enforce existing laws regarding railroad crossing will do more good than adding signaling to presently unsignaled crossings.