That's some bad luck... most of the time you'll be the only person with the trips. The lower the card is, the more likely it's just you. I usually play it like this: check, wait to see if someone else bets, then raise them. They'll almost always fold if they don't have it. If they have it and their kicker isn't crap, they'll re-raise and you can let it go there. If they paired the other card on the board they might also just call, and then I'd suggest playing it with cautious aggression. Bet on all streets, but don't feel like you have to ramp up the bets so much.