Just a bit more info on Upbeat Co., which makes bike, car, boat, and custom application trailers.
I visited their factory this morning, and I was pretty impressed- it's in an industrial park a few km from Suvarnabhumi- I wanted to check out one-and two-bike trailers- I let them know in advance that I was coming, and they had one of each ready for me to inspect.
All the welds looked perfect (a lot of it is automated), and all spots where different materials meet (i.e. where the diamond plate fits near the stainless frame) were exactly aligned- the space was consistent from one end to the other, and nothing was loose or out-of-line (there were a few others in various states of completion that I took a look at to make sure they weren't showing me their only perfect examples- everything looked the same)- the bottom line is that I am absolutely confident of the quality of their workmanship.
A big concern for me was how easily I could manipulate the trailer myself when it wasn't attached to my truck- with the single trailer empty, I could wheel it around (on the concrete floor, which is of course not indicative of a real-world road surface) no problem- I'm sure I could move it on level ground with a bike on it without an issue, and could pull it uphill (empty) if I had to. The double trailer is considerably wider and heavier- I could move it around, but it took a lot more effort, and with a bike on it it would have been a real struggle- with two bikes there would have been no chance- also, the increased width was a big concern- while the single trailer wouldn't be too big of a deal to move through narrow streets, I think the double would be a real bitch.
I didn't make a purchase yet, though I think I'm going to get the single- I really want the double, but it just looks too big (even stored side-by-side- they both fold up there is a very big difference)- I need to give it more though, and possibly take a test-drive with each of them if possible.