I have a hallmark trailer similar to the one previous. Tiny wheels / tires and has the torsional rubber suspension. It is from the 80's so i'm sure things have improved but for what it's worth, it's a great little trailer. Specifically why I liked it is because it is so tiny it doesn't take up much space. As for the bad points which I didn't really take into consideration:
Being so small and low, without the jetski on it, while towing with my car (Subaru Impreza) I can't even see the trailer on the back. So reversing sucks. Could just attach a 'beach pole' or flag onto it but for now I just have a friend stand on it when backing down the boat ramp to give me a point of reference for the trailer.
The other downside is due to having such small wheels and tires they tend to wear quite a bit faster than a larger sized tire and can also be more difficult to source (for me anyway).
If you'd like any dimensions or anything I can do that for you.