This may be helpful to others considering tow vehicles. I recently purchased a 2013 Hyundai Accent with manual transmission for the express purpose of towing four down. Information on the suitability of towing a manual Accent four down was scarce or contradictory, which caused me no end of frustration.
The manual completely ignores the issue of recreational towing and the dealer (and others I asked) gave me contradictory information. All I could find is a 2008 technical service bulletin which is generic to all Hyundai vehicles. My experience, based on one trip of about 3000 miles, is that there is no problem four-down towing a 2013 Hyundai Accent with manual transmission.
Place the car in neutral, key in ignition on ACC, hand brake off, radio and display off (even the clock does not display). I experienced no battery problems, no speed limitations and no transmission issues (so far!). There was no need to start the vehicle every so often. Blue Ox makes the base plate and suitable tow bar (I used Aladdin). It cost me about $2000 CDN to get it ready to tow.