This isn't a vintage Trailer, but I think it's neat. My kids and I visited a local museum in the very small town of Swedsburg, Iowa. It has quite a Swedish heritage.
This wagon was called a Huckster. It was filled with dry goods and traveled the area to sell household goods to the local farm wives, kind of like a Walmart on wheels.
I image it was very exciting for those early pioneers to have someone come to their farms with this array of new goods.