Found this article, talks about most vehicles should be able to tow their own weight.
http://www.curbsideclassic.com/auto-biography/the-great-american-anti-towing-conspiracy/
Coming from Africa where seeing a hitch on a sedan is common, I have always been amazed at the general lack of hitches on sedans that you see here in the US. Even on a recent trip to the UK, a small car towing a trailer is very common, but I get some very weird stairs when I roll up to the dump with my 4x8 trailer behind my Saturn Ion loaded up with debris. Ive been towing skis and junk with my Saturn for over 60,000 miles to date, getting 25mpg.
And as far as the motorcycle towing a stand up, thats an awesome idea! Saw this a few year ago, again, where I grew up, motorcycles with trailer for delivering good was common...