Here's my newest towing rig. It's the 4'x4' (40"x48" usable) aluminum from Amazon but made by Ultra-Tow. I bought it direct with free shipping early in 2020 for $199 US. In late Feb/2020 I picked it up the day before the border closed. I finally got around to assembling it. Here is it mounted on my Mirage.
Remarkable its rated for 1060 lbs cargo, meaning it + the cargo is about 1200 lbs, which is over the Mirage gvwr of 900 lbs but even if you cut way back on the cargo there's still a range of 700-900lbs you can tow in near total safety.
It's really light, the manual says 135 lbs and I believe it. Take away the steel/rubber wheels/springs/hub/axle and the remaining AL probably weights all of 50/60 lbs. It pulls like a charm, I've had, I guess, over 770 lbs on it so far, a platform of plywood and 750 lbs of salt and sand for the winter. DI have any regrets? YEP. I shoulda bought 2, or 3. The last price I could find for it was $500 US and it was back ordered, maybe even disc0'd.
Here's another pic, just because I can
Finally, it appears they might still make the 4'x8' foldable model. It's $1000 US, more or less, but perhaps it will be on sale one day. It's marginally heavier, 195 lbs leaving you with still 970 lbs of 1000 lbs of cargo. If I ever see them I will buy 2. Here's a pic