Mazda North American does not officially support towing with this vehicle..., but in the UK they do!! In the United Kingdom, the 5 can be had with any of four different 4-cylinder engines. According to Mazda's UK website, the weights they can tow are rated as follows:
Trailer without brakes
For all engines: 600 kg, or 1322 lbs.
Trailer with brakes (12% gradient)
~110 hp 1.8 gas: 1300 kg, or 2866 lbs
~145 hp 2.0 gas: 1400 kg, or 3086 lbs
~110 hp 2.0 diesel: 1400 kg, or 3086 lbs
~143 hp 2.0 diesel: 1400 kg, or 3086 lbs
So, as per Mazda, I'd keep that max weight under 1300 pounds, especially since it's not rated for towing here.
And just double check your max tongue weight, I installed a "hidden hitch" on my 5 and it's max tongue weight is only 200 lbs, so... just be carefull! -
http://www.etrailer.com/Trailer-Hitc...cleid=20077475
If you're careful and use common sense there is no reason this vehicle can not do some moderate towing. I installed the hitch myself and am fully confident in it's attachment points. I bought a small (4 foot x 4 foot) trailer and use it all the time to tow camping gear, stuff to the dump, topsoil, etc, etc... add a hitch and have fun!
Also make sure you buy a plug and play wiring system for your trailer lights if you go the trailer route. It's actually very easy to install... and this thread has some good tips... I did it through the interior the way one of the posters mentions -
http://www.mazdas247.com/forum/showthread.php?123746422-trailer-light-wiring and used this kit -
http://www.etrailer.com/Custom-Fit-Vehicle-Wiring/Mazda/5/2007/118520.html?vehicleid=20077474