LOL. I like your thoughts
It sounds like it should be good to go though given its rated to 300kg. Seeing as how a van or trailer with 300kg bar weight is going to potentially bounce just as hard on the bar. Again, nice work.
I saw another variation at the shopping centre on the weekend but designed to carry am electric wheel chair, or maybe the mobility scooter.
Anyway, it was a fold down tray attached in a very similar manner, but when folded down had a 14in shopping trolley type wheel at the end to support the extra weight. Was pretty cool.