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Hi Mike,
Our house runs on solar. We have two sets of four panels, both going into their own regulator which are both connected to the batteries along with a 50amp Victron charger than runs from a Yamaha 2400w inverter. The whole lot can be going at once if need be (though that would be a bit much charge for the batteries for any length of time). So we are essentially running the system your thinking of no problems. Each controller/charger looks at the battery volts and adjusts accordingly and I've never noticed any conflict. Batteries are 660ah 2v cells x 12 for a 24v system.
I would wire the panels in series - I find I get better results on cloudy days with the higher voltage/mppt controller setup than running the panels in parallel. (or two parallel sets in series).
Wow, you're drawing 25 amps / 300w continuously from your setup? That's a goodly amount of juice! One of those little 2kva Honda generators would do the trick and be easy to cart around and would power a little 20amp 12v charger no problems. They have a pretty good rep in the caravanning groups. I'd put some big fuses on the battery too. I'm also a big fan of the Victron brand of gear too - chargers/mppt's/inverters etc - very good gear.
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