You bet...you can charge em' both at the same time...
If you're using a 'portable' charger, when the batteries are hooked in parallel (pos - pos, neg -neg) it's best to hook the POS charge lead on one battery, and the NEG charge lead on the OTHER battery - that way you'll have about the same level of charge for both, as the resistance in the parallel cables and connections tend to even out.
If I'm setting up a battery bank, I like to hook up the cables going to the Load, in the same manner...however your batteries probably aren't hooked up that way in your trailer, at lease mine aren't - each pair of leads come into the fuse panel and are hooked together there - but it works just fine.
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Ray & Pat; Morada, CA
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