Well, yes and no. You can only wire the batteries in series, or in parallel, but you can't do both at the same time! You will let the smoke genie out!My 710 has two 12 volt batteries connected in series to give 12 + 12 = 24v. Each battery has 2 + and 2 - posts and only one of each is needed to wire the circuit. The other posts can be wired in parallel to create a second circuit with 12v and twice the amperage.Treat it with respect!
And you will not be happy afterwards! 
And you might be taking an unexpected trip to the hospital, or worse... But you can use a winch with a 60A equalizer; while the equalizer can't keep up with the current that the winch can draw, it will help to recharge the lower (12V) battery over time when you are not running the winch. The secret is that the equalizer needs to have more capacity than the alternator so it can take more current from the upper battery than the alternator creates; this prevents overcharging the upper battery. The lower battery will get charged, eventually, and all will be well at that time. And if you go this route then you can power all your 12V devices from the lower battery, too. However, you must be very careful how it is wired with the battery switch and general operation -- 1) you need to disconnect the equalizer when not running or it will gradually drain the batteries. 2) if the battery switch is off, and (for example) you try to crank the engine, the system reverses the 12V polarity to all your 12V devices which can destroy them. It all depends on how the equalizer is switched. It has to have at least two leads (the ground and 12V connections) disconnected to prevent this, so it takes more than a "simple" switch.... use an equalizer (very expensive) between the two batteries in the 24v battery pack and then take power from one of the batteries ... However the max amps these can provide is about 60 amps so not enough to equalize the batteries when a winch is being used.
There are a multitude of ways to use 12V accessories in a Pinz and most of the above suggestions are very good options. You get to choose what is best for you. Generally, the most common outcome of a poor choice is that you will be replacing batteries much more often than you expect, and you will have more chances to make a better choice in the future.
To recap: 1) get a 24V winch. 2) get a 24-12V converter for the low amperage draw 12V devices (radios, CBs, chargers, etc.). 3) Get a 24V to 12V trailer converter if you really have to pull a lot of 12V trailers often. There are other ways to skin this cat, but most of them have their own drawbacks, too.
