Hello Craig,
From the cars perspective you are legally allowed tow a trailer up to the manufactures stated limit for the model. I sense that you are already aware of that.
Your driving licence may be another legality to consider:- If you passed your test before 1st Jan 1997, then you will automatically be awarded category BE which generally entitles you to drive a vehicle and trailer combination up to 8.25 tonnes MAM.
However if you passed your test after 1st Jan 1997 then you will only have Category B without the E. This only includes vehicles to be coupled with a trailer up to 750kgs MAM (allowing a combined weight up to 4.25 tonnes MAM) or a trailer over 750kgs MAM provided the MAM of the trailer does not exceed the unladen weight of the towing vehicle, and the combination does not exceed 3.5 tonnes MAM.
Note the licence limits refers to MAM not actual weights. Maximum authorised mass (MAM), is the permissible maximum weight, also known as the gross vehicle weight The combined MAM mentioned above would be the towing vehicles MAM plus the caravans MTPLM.
You must check your manufactures data carefully because from my sources I understand the Mazda 6 has a Unladen Weight (ULW) of about 1550Kg and a Gross Vehicle Weight GVW or MAM) of 2100Kg, and is rated to tow up to 1600Kg. If you only have the Cat B licence, then the biggest caravan MTPLM you are allowed is 3500-2100 = 1400Kg.
Mechanically there is nothing stopping you doing it. The point soozeeg makes about the additional load of clothes etc, is already accounted for in the caravans MTPLM,
Is it sensible or is it a good match?
Good sense leads you to the conclusion that it is always better to keep the mass of the trailer as small as possible relative to the mass of the towing vehicle. In the UK caravanning organisations suggest that a mass ratio of .85 (85%) MTPLM of Trailer /Kerbweight of towing vehicle) is optimum, but in practice that is not a guarantee of a good match. Good matching is down to a lot of other factors of which the towing ratio is just one.
Getting going at 100% is not difficult, but controlling it and stopping might be, so it is only suggested that competent caravanners should attempt it with considerable caution.