The first problem I see coming is tongue weight. According to the 2010 brochure , attached, you're rated at 500 pounds max tongue weight. I don't think you can make that happen.
Second, the 5,000 pounds max trailer weight may be iffy as well. What is the weight of the two Harleys and the golf cart? Take that number and deduct it from 5,000 max trailer weight and you have how much the trailer it self can weigh.
Finding a trailer that big that only weighs around 2,000 to 2,500 pounds may be difficult. The ones I found like
this one, weigh closer to 3,500 pounds empty. And the empty tongue weight of 540 pounds is a deal breaker for me.
Taking either the Harleys
or the golf cart in a smaller trailer should be doable.