Things at HF change a lot, so be aware: what you get may not be what you expect based on what someone else got! (edit Dec 17 - Sorry, what I said about my springs was not correct.)
HF recently had 2
FOLDING 4x8 trailers, one with 8 inch wheels and the other with 12, but now I see only one model listed. They used to have a
5x8 version very much like the ‘super duty 1720#' with a tail gate and sides, but that is gone too.
I now see that there are
two different stock numbers for their “1720 Lb Super Duty" trailer, 94564 and 69897. The ads appear identical, but is there any difference?? They have different manuals and it is not clear what the differences are, but one difference is the recent #69897 says you can not exceed 45 mph.
I purchased two of the the “super duty” 4x8 trailers, one in 2006 had a stock number of 6464 and the one I bought this past summer was the 94564. The first was made in Taiwan but the second was made in China. Based on the ads and specs I was expecting the same trailer, but my experience with the second trailer differed like night from day compared with the first purchase. You can read some of the story in
http://www.tnttt.com/viewtopic.php?f=35&t=61451but in brief: I had almost no problems with the first and would give a strong recommendation

based on my experience with it. I spent a month trying to figure out the problems I encountered with the second one and still do not have an operational trailer.
I purchased the second trailer on 28 July 2014 and as of today (15 Dec) I am still waiting for replacement of defective parts. 