2 options I am considering, one is like the one Meme has pictured - small dolly wheels on a long tube, ball on one end, hitch on the other.
The other option and a few people here use the idea, is just to have a decent sized wheel on a proper hub mounted on the trailer drawbar so that when you drop the drawbar it takes the noseweight and the trailer will roll straight backwards without turning to the side. Then all you need is either a rope to pull it back up or a straight bar with a ball on one end and hitch on the other if you need to push it out with the vehicle. Photo is attached of one, not a great photo as most of the trailer is under water but you get the idea. From what I have seen it seems to work well as the large tyre (much larger than a jockey wheel) rolls easily even on a beach.
A Boat is a hole in the water, surrounded by fibreglass, into which you throw money...
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